Abstract
Photosynthesis of various organs and their contribution to formation of ear caryopsis were measured using14CO2 labeled carbon in the phase of caryopsis formation of spring wheat plants (Moskovskaya-35). It turned out that inclusion of14C into amino acids is more than twice as high in photosynthesis of an ear. Among labeled low molecular weight compounds in caryopsis, during a short exposure (2 hours) after photosynthesis, the most of the labeled carbon in the14CO2 was found from the photoassimilates of the flag leaf (70.4%); from the ear (55.8%), and the least – from the stem under the flag (41.5%). The difference in inclusion of14C into the caryopsis’ total proteins was observed only with a short exposure of the photosynthesizing organ (2 hours). Water-soluble proteins, as products of photosynthesis of the flag leaf, were synthesized for the most in the caryopsis (flag – 73.9%; stem – 46.4% and ear – 44.8%), and in the synthesis of complex proteins, which are soluble in alkali and Triton X-100, most of14C was from the products of photosynthesis of non-leaf organs (10.5; 21.5; 28.4 and 4.3; 12.5; 13.4), respectively.
Highlights
The first studies of the assimilation activity of the ears were started a long time ago [1, 2]
It was shown that different chlorophyll organs differ in the daily dynamics of photosynthesis [3], and the photochemical activity of chloroplasts of non-leaf organs, determined by Hill reaction and CO2 fixation, is 2-3 times higher than chloroplasts isolated from flag leaves [4]
After 2 minutes of adding the 14CO2 to various wheat organs, the plants were divided into parts and fixed in boiling ethanol, followed by analysis of the distribution of 14C between low molecular weight and alcohol-soluble products of photosynthesis [7]
Summary
The first studies of the assimilation activity of the ears were started a long time ago [1, 2]. Various researchers’ assessment on assimilation activity of chlorophyll-containing organs during plant development is significantly different. This is due to the ontogenetic change in the metabolism of various acceptors of photoassimilates [5]. This side of the issue somehow remained indifferent from the attention of researchers
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