Acram Taji - Academia.edu (original) (raw)

Papers by Acram Taji

HortScience

A number of Australian woody species are shown to differ widely in adventitious root production i... more A number of Australian woody species are shown to differ widely in adventitious root production in vitro in response to the type and combination of hormones applied, although the most effective combinations usually included IBA. Shoots of Eremophila lanii F. Muell produced roots on a medium containing cytokinins and no auxin. Two species, Prostanthera striatiflora F.v.M and Correa decumbens F.v.M., required reduced pH and a period of darkness for root induction, whereas these conditions inhibited Grevillea biternata Meissner. There also is an interaction among hormone treatment, media pH, and the effect of continuous light vs. a period of darkness. Chemical names used: 1H-indole-3-butanoic acid (IBA); naphthhalene acetic acid (NAA); indole-3-acetic acid (IAA); B-naphthoxyacetic acid (NOA); 6-furylaminopurine (KIN); N-(phenylmethyl)-1H-purin-6-amine (BA).

One of the impediments to commercialisation of Sturt's Desert Pea a cut flower is the product... more One of the impediments to commercialisation of Sturt's Desert Pea a cut flower is the production of large amount of pollen grain in flowers. This brings about the reduction in flower quality due to petal staining by the pollen grains which are shed during transportation. In addition, during transportation pollination may occur, resulting in rapid degeneration of flowers and thus reduction in the vase life of the flowers. Our work is focussed on the production of sterile plants by manipulating the ploidy level. The strategies used are via in vitro and in vivo techniques. In vitro strategy is centred around the production of haploid plants using anther culture. Since pollen grains are haploid, plants regenerated from them are also haploid. With the in vivo strategy, we aim to produce triploid plants. Step one in the process is to produce plants that are tetraploid by application of chemical colchicine (colchicine acts by disrupting spindle formation during mitotic cell division) t...

Acta Horticulturae, 2000

Light effects including its intensity, wavelength, and duration are important environmental facto... more Light effects including its intensity, wavelength, and duration are important environmental factors that affects flavonoid accumulation. Ultraviolet (UV) light can induce flavonoid biosynthesis. Under normal condition, flavonoids are produced in response to stress, and they function as UV filters. In this paper, we review how light quality and quantity affect the accumulation of flavonoid in plant species. High light intensity can influence flavonoid accumulation, but in heliophytes, the opposite is true. Some medicinal plants require shady environment for flavonoid accumulation. In monocots, the flavonoid is situated in both epidermis and mesophyll while in dicot, it is found only in the epidermis. This review leads to a conclusion that high variation in flavonoids accumulation in response to light can occur within and between plant species.

Program Studi Agronomi, Fakultas Pertanian, Universitas Bengkulu, 2008

The work reported here was aimed at determining the duration of pollen viability and stigma recep... more The work reported here was aimed at determining the duration of pollen viability and stigma receptivity in Swainsona formosa (Sturt’s desert pea, an Australian native legume), as an initial step in conventional breeding via artificial crossing by hand pollination. The pollen viability was determined for pollen shed from anthers and retained inside the keel under glasshouse conditions (temperature 25 - 32oC, light intensity ranging from 650 - 1200 µmol m-2 s-1 and photoperiod 10 – 14 hours) and for pollen harvested from anthers and stored under cold (4oC) and total darkness conditions. The receptivity of stigma was determined using stigma on intact plants under glasshouse conditions. The stigmatic surface was exposed and rubbed with fingertips. Pollen from anthers which had just begun shedding was applied to the stigmatic surface one day prior to anther dehiscence, on the day of anther dehiscence and daily thereafter until 8 days after anther dehiscence. The result indicated that pol...

Organic agriculture: a global perspective, 2006

This paper discusses the advantages and disadvantages of tillage in organic agriculture, and deta... more This paper discusses the advantages and disadvantages of tillage in organic agriculture, and details its impacts on the environment. Aside from the climatic factors, socioeconomic and cultural factors also influence the attitude of organic farmers toward tillage. Some agronomically based concepts of tillage management in organic agriculture are presented. Finally, differences between the expected effects of tillage management in conventional and organic systems are addressed.

Teaching in the Sciences, 2005

Himpunan Ilmu Gulma Indonesia, 2011

Chapter 5 Distributed Problem-Based Learning and Threaded Discourse Lisa Lobry de Bruyn ... SCIEN... more Chapter 5 Distributed Problem-Based Learning and Threaded Discourse Lisa Lobry de Bruyn ... SCIENCES TABLE 5.1 (continued) Student activities Examples Student skills and competency development areas ... Barrows, and Crooks (1999) as the use of PBL in online courses. ...

The commercialization of Sturt's Desert Pea as cut flowers is subjected to petal staining by ... more The commercialization of Sturt's Desert Pea as cut flowers is subjected to petal staining by pollen grains which are shed during transportation, and therefore the flowers quality reduces significantly. In addition, during transportation self pollination may take place, resulting in a rapid degeneration of flowers and thus reduction in the vase life of the flowers. Our current work is focussed on the production of male sterile plants via anther culture. Anther contains microspores that are haploid, and plants regenerated from microspores within the anther will also be haploid. Haploid plants are sterile because where there is an odd number of chromosome sets reproductive fertility is usually impaired. This is because during cell division the normal pairing of chromosome can not properly take place since one set of chromosomes will have no homologous set to pair with, and as such gametes fail to form. The first step of this strategy is to investigate plant hormones that are suitab...

Organic agriculture: a global perspective, 2006

This chapter begins with an overview of organic farming and considers the place of education with... more This chapter begins with an overview of organic farming and considers the place of education within it. Focusing primarily on the goals and structure of courses and curricula in the academic environment, it presents the experience of a small group of educators in setting up course units and programmes in the Nordic region and in the USA. Important questions related to agricultural education are considered, and the chapter concludes with a set of perspectives considered useful for the conceptual and structural changes needed towards designing an appropriate learning landscape for organic agriculture.

HortScience

A number of Australian woody species are shown to differ widely in adventitious root production i... more A number of Australian woody species are shown to differ widely in adventitious root production in vitro in response to the type and combination of hormones applied, although the most effective combinations usually included IBA. Shoots of Eremophila lanii F. Muell produced roots on a medium containing cytokinins and no auxin. Two species, Prostanthera striatiflora F.v.M and Correa decumbens F.v.M., required reduced pH and a period of darkness for root induction, whereas these conditions inhibited Grevillea biternata Meissner. There also is an interaction among hormone treatment, media pH, and the effect of continuous light vs. a period of darkness. Chemical names used: 1H-indole-3-butanoic acid (IBA); naphthhalene acetic acid (NAA); indole-3-acetic acid (IAA); B-naphthoxyacetic acid (NOA); 6-furylaminopurine (KIN); N-(phenylmethyl)-1H-purin-6-amine (BA).

One of the impediments to commercialisation of Sturt's Desert Pea a cut flower is the product... more One of the impediments to commercialisation of Sturt's Desert Pea a cut flower is the production of large amount of pollen grain in flowers. This brings about the reduction in flower quality due to petal staining by the pollen grains which are shed during transportation. In addition, during transportation pollination may occur, resulting in rapid degeneration of flowers and thus reduction in the vase life of the flowers. Our work is focussed on the production of sterile plants by manipulating the ploidy level. The strategies used are via in vitro and in vivo techniques. In vitro strategy is centred around the production of haploid plants using anther culture. Since pollen grains are haploid, plants regenerated from them are also haploid. With the in vivo strategy, we aim to produce triploid plants. Step one in the process is to produce plants that are tetraploid by application of chemical colchicine (colchicine acts by disrupting spindle formation during mitotic cell division) t...

Acta Horticulturae, 2000

Light effects including its intensity, wavelength, and duration are important environmental facto... more Light effects including its intensity, wavelength, and duration are important environmental factors that affects flavonoid accumulation. Ultraviolet (UV) light can induce flavonoid biosynthesis. Under normal condition, flavonoids are produced in response to stress, and they function as UV filters. In this paper, we review how light quality and quantity affect the accumulation of flavonoid in plant species. High light intensity can influence flavonoid accumulation, but in heliophytes, the opposite is true. Some medicinal plants require shady environment for flavonoid accumulation. In monocots, the flavonoid is situated in both epidermis and mesophyll while in dicot, it is found only in the epidermis. This review leads to a conclusion that high variation in flavonoids accumulation in response to light can occur within and between plant species.

Program Studi Agronomi, Fakultas Pertanian, Universitas Bengkulu, 2008

The work reported here was aimed at determining the duration of pollen viability and stigma recep... more The work reported here was aimed at determining the duration of pollen viability and stigma receptivity in Swainsona formosa (Sturt’s desert pea, an Australian native legume), as an initial step in conventional breeding via artificial crossing by hand pollination. The pollen viability was determined for pollen shed from anthers and retained inside the keel under glasshouse conditions (temperature 25 - 32oC, light intensity ranging from 650 - 1200 µmol m-2 s-1 and photoperiod 10 – 14 hours) and for pollen harvested from anthers and stored under cold (4oC) and total darkness conditions. The receptivity of stigma was determined using stigma on intact plants under glasshouse conditions. The stigmatic surface was exposed and rubbed with fingertips. Pollen from anthers which had just begun shedding was applied to the stigmatic surface one day prior to anther dehiscence, on the day of anther dehiscence and daily thereafter until 8 days after anther dehiscence. The result indicated that pol...

Organic agriculture: a global perspective, 2006

This paper discusses the advantages and disadvantages of tillage in organic agriculture, and deta... more This paper discusses the advantages and disadvantages of tillage in organic agriculture, and details its impacts on the environment. Aside from the climatic factors, socioeconomic and cultural factors also influence the attitude of organic farmers toward tillage. Some agronomically based concepts of tillage management in organic agriculture are presented. Finally, differences between the expected effects of tillage management in conventional and organic systems are addressed.

Teaching in the Sciences, 2005

Himpunan Ilmu Gulma Indonesia, 2011

Chapter 5 Distributed Problem-Based Learning and Threaded Discourse Lisa Lobry de Bruyn ... SCIEN... more Chapter 5 Distributed Problem-Based Learning and Threaded Discourse Lisa Lobry de Bruyn ... SCIENCES TABLE 5.1 (continued) Student activities Examples Student skills and competency development areas ... Barrows, and Crooks (1999) as the use of PBL in online courses. ...

The commercialization of Sturt's Desert Pea as cut flowers is subjected to petal staining by ... more The commercialization of Sturt's Desert Pea as cut flowers is subjected to petal staining by pollen grains which are shed during transportation, and therefore the flowers quality reduces significantly. In addition, during transportation self pollination may take place, resulting in a rapid degeneration of flowers and thus reduction in the vase life of the flowers. Our current work is focussed on the production of male sterile plants via anther culture. Anther contains microspores that are haploid, and plants regenerated from microspores within the anther will also be haploid. Haploid plants are sterile because where there is an odd number of chromosome sets reproductive fertility is usually impaired. This is because during cell division the normal pairing of chromosome can not properly take place since one set of chromosomes will have no homologous set to pair with, and as such gametes fail to form. The first step of this strategy is to investigate plant hormones that are suitab...

Organic agriculture: a global perspective, 2006

This chapter begins with an overview of organic farming and considers the place of education with... more This chapter begins with an overview of organic farming and considers the place of education within it. Focusing primarily on the goals and structure of courses and curricula in the academic environment, it presents the experience of a small group of educators in setting up course units and programmes in the Nordic region and in the USA. Important questions related to agricultural education are considered, and the chapter concludes with a set of perspectives considered useful for the conceptual and structural changes needed towards designing an appropriate learning landscape for organic agriculture.