GPA Research Papers - Academia.edu (original) (raw)

Transpiration is one of the most important Part of the plant. Transpiration occurs through the Stomata and Lenticels. The factors that greatly influence and control stomatal movements i.e., opening and closing of stomata, e.g., Light,... more

Transpiration is one of the most important Part of the plant. Transpiration occurs through the Stomata and Lenticels. The factors that greatly influence and control stomatal movements i.e., opening and closing of stomata, e.g., Light, Temperature, Atmospheric Humidity, Wind, Available Soil Water, Root/Shoot Ratio. But modern research found that Stomata Controlled by G-protein or G-protein's subunit. Land plants must balance CO 2 assimilation with transpiration in order to minimize drought stress and maximize their reproductive success. The ratio of assimilation to transpiration is called transpiration efficiency (TE). TE is under genetic control, although only one specific gene, ERECTA, has been shown to regulate TE. We The α-subunit of the heterotrimeric G protein in Arabidopsis (Arabidopsis thaliana), GPA1, is a regulator of TE. gpa1 mutants, despite having guard cells that are hyposensitive to abscisic acid-induced inhibition of stomatal opening, have increased TE under ample water and drought stress conditions and when treated with exogenous abscisic acid. The increased TE and reduced whole leaf stomatal conductance of gpa1 can be primarily attributed to stomatal density, which is reduced in gpa1 mutants. In this study, the G-protein signaling pathway was also found to regulate stomatal density on the lower epidermis of Arabidopsis cotyledons. The loss-of-function mutation of the G-protein alpha-subunit (GPA1) showed a reduction in stomatal density, while overexpression of the constitutively active form of GPA1(QL) increased stomatal density, indicating a positive role of the active form of GPA1 in stomatal development, which help transpiration rate. GPA1 regulates stomatal density via the control of epidermal cell size and stomata formation. GPA1 Mutants Have vital role for transpiration or transpiration efficiency i.e., Increased TE under Ample and Low Soil Water Conditions, pa1 Mutants Have Reduced Carbon Isotope Discrimination When Treated with ABA, gpa1 Mutants Are More Sensitive to Low-CO 2-Induced Stomatal Opening, gpa1 Mutants Have Reduced Stomatal Density and Stomatal Index in Mature Leaves. G-protein-coupled receptors (GPCRs) are so named because they interect with G protein, as discussed below. This work in this thesis investigates G protein function at the whole-plant level in attempt to understand this missing component of our knowledge of G protein function in plants.