Influence of water stress on leaf photosynthetic characteristics in wheat cultivars differing in their susceptibility to drought
Year: 2006
Type: article
Abstract: A gradual reduction in leaf water potential (Ψleaf), net photosynthetic rate (P N), stomatal conductance, and transpiration rate was observed in two drought tolerant (C 306 and K 8027) and two susceptible (RW 893 and 899) genotypes subjected to water stress. The extent of reduction was lower in K 8027 and C 306 and higher in RW 893 and RW 899. Rewatering the plants after 5 d of stress restored P N and other gas exchange traits in all four cultivars. Water stress had no significant effect on variable to maximum fluorescence ratio (Fv/Fm) indicating that water stress had no effect on primary photochemistry of photosystem 2 (PS2). However, water stress reduced the efficiency of excitation energy transfer (F'v/F'm) and the quantum yield of electron transport (ΦPS2). The reduction was more pronounced in susceptible cultivars. Water stress had no significant effect on photochemical quenching, however, the non-photochemical quenching increased by water stress.
Source: Photosynthetica
Authors: D. Subrahmanyam, N. Subash, A. Haris, A. K. Sikka
Institution: Indian Council of Agricultural Research
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2037072240