Influence of climatic conditions (total precipitation and sunshine duration) on the dynamics of chlorophyll photosynthetic potential (CPSP) and its relation to productivity of crop stands was studied with long- and short-stalked cultivars of winter wheat (Triticum aestivum L.). The reduction of the total exposure time to solar photosynthetically active radiation by 100 h per growing season (humid year) was shown to decrease CPSP by a factor of 1.3 and 1.5 in long-stalked and short-stalked cultivars, respectively. The decrease was mainly related to the suppression of biomass production, one of the main constituents of photosynthetic potential. Retardation of growth processes was manifested in a twofold decrease in the shoot number per m2 on average; furthermore, morphological stages were delayed during early development. Suppression of growth processes by the shortened sunshine time was not compensated for by a 30% increase in specific chlorophyll content (as distinct from shade leaves), the other component of CPSP. It was shown that growth conditions have an effect on the correlation coefficient between CPSP and productivity.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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