Drought-induced changes in photosynthetic membranes of two wheat (Triticum aestivum L.) cultivars.
Two wheat (Triticum aestivum L.) cultivars contrasting in architectonics and differing in drought resistance, Azamatli-95 (short stature, vertically oriented small leaves, drought-tolerant) and Giymatli-2/17 (short stature, broad and drooping leaves, drought-sensitive), were studied. It was found that the content of CP I (115 kDa) and 63-kDa apoprotein P700 and also LHC II polypeptides increases slightly in the drought-resistant cv. Azamatli-95 under extreme water supply limitation, while their content decreases in drought-sensitive cv. Giymatli-2/17. The intensity of synthesis of alpha- and beta-subunits of CF(1) (55 and 53.5 kDa) and 33-30.5 kDa proteins also decreases in the sensitive genotype. The intensity of short wavelength peaks at 687 and 695 nm sharply increases in the fluorescence spectra (77K) of chloroplasts from Giymatli-2/17 under water deficiency, and there is a stimulation of the ratio of fluorescence band intensity F687/F740. After exposure to drought, cv. Giymatli-2/17 shows a larger reduction in the actual PS II photochemical efficiency of chloroplasts than cv. Azamatli-95.
Huseynova
I M
IM
Institute of Botany, National Academy of Sciences, Baku, AZ 1073, Azerbaijan.
Suleymanov
S Y
SY
Rustamova
S M
SM
Aliyev
J A
JA
D002462:Cell Membrane / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002736:Chloroplasts / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D055864:Droughts; D010788:Photosynthesis; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D013057:Spectrum Analysis; D014908:Triticum / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
D010940:Plant Proteins