The effect of high temperature(HT) on aspartate aminotransferase(AAT), aspartokinase(AK) activities and the contents of Aspfamily amino acids and protein components in grains were measured at rice grain filling stage with japonica rice variety Koshihikari and indica rice variety IR72 as materials. The results indicated that the activities of AAT and AK and the relative contents of Asp, Lys, Thr, Met and Ile in grains significantly increased under HT, and AAT and AK activities were significantly positively correlated with Aspfamily amino acids contents, suggesting that AAT and AK in rice grains may play an important role in the increase of Aspfamily amino acids contents in grains under HT. Additionally, the results indicated that HT during grain filling contributed to the increase of relative contents of protein components and Aspfamily amino acids contents, the accumulation of glutelin and Aspfamily amino acids, and the improvement of the ratio of part of Aspfamily amino acids contents in crude protein. However, the contents of protein components and part of Aspfamily amino acids in spikelet decreased under HT during rice grain filling.
LIANG Chenggang#, ZHANG Qing#, LI Jing, XIONG Dan, XU Guangli, WANG Yan, LIU Quan, HUANG Peng, LI Tian*
. Effect of High Temperature on Aspartate Metabolism Enzyme Activities and Aspartatefamily Amino Acids Contents at Rice Grainfilling Stage[J]. Chinese Journal OF Rice Science, 2013
, 27(1)
: 71
-76
.
DOI: 10.3969/j.issn.10017216.2013.01.010
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