Rootstock-mediated changes in xylem ionic and hormonal status are correlated with delayed leaf senescence, and increased leaf area and crop productivity in salinized tomato (original) (raw)

Impact of Salt-tolerant Rootstock on the Enhancement of Sensitive Tomato Plant Responses to Salinity

HortScience, 2019

In the present study, salt-tolerant (Tom 174) and sensitive (Tom 121) tomato genotypes were grafted onto their own roots (174/174 and 121/121), and a susceptible genotype was also grafted onto tolerant genotype 121/174. The grafted plants were grown under 50 mm NaCl and control conditions in a greenhouse. Plant physiological parameters, fruit yield, and physical measurements of fruit (e.g., weight, height, diameter, volume), and chemical analysis of fruit (e.g., vitamin C, pH, and total dry matter content) were investigated. When the sensitive genotype was grafted onto tolerant genotype 121/174, the tolerant genotype Tom 174 reduced the yield loss of susceptible genotype from 44% to 3%. Also, fruit size, total dry matter content, and vitamin C increased, while pH decreased under saline conditions. The rootstock Tom 174 seemed to be able to control sensitive scions’ stomatal openness and closure for transpiration and CO2 transition on photosynthesis because dry matter content was inc...

Physiological And Molecular Studies Of Tomato Under Salinity Stress

2010

The aim of the present investigation was to determine the effect of salt stress on the physiology of twelve genotypes of tomato (Solanum lycopersicum L.), to study the genetic diversity among these genotypes and to transfer salt tolerant gene in the selected genotype through Agrobacterium mediated gene transformation method.The seeds of different tomato genotypes were obtained from Ayub Agricultural Research Institute (AARI), Faisalabad and from Horticulture Research institute (HRI), NARC, Islamabad. First experiment comprises study of plant growth, ionic content, ABA content of shoot and root and proline content at four different NaCl salinity level.The genotypes Avinash, NTH242 and Gol performed better at higher salt concentration as indicated by less inhibition of plant height, shoot and root fresh weight and shoot and root dry weight.There was less translocation of Na+ to shoot but greater accumulation of K+ and Ca2+ concomitant with higher production of osmoregulant (proline) a...