水稻黄叶突变体黄玉B的碳代谢特性

Carbon Metabolism Characteristics of a Xanthan Rice Mutant ‘Huangyu B'

以黄叶突变体黄玉B及其野生型亲本龙特甫B为材料,对光合色素与可溶性糖含量、RuBP羧化酶(RuBPCase)、蔗糖合成酶(SS)及蔗糖磷酸合成酶(SPS)活性、干物质及有机碳积累量等碳代谢相关指标进行了测定。与龙特甫B相比,黄玉B叶片光合色素含量显著下降,但Chla/b和Car/Chl值显著增高。在分蘖期,黄玉B叶片可溶性糖含量、RuBPCase、SS和SPS活性显著高于龙特甫B,而在开花期均显著降低;开花前黄玉B单株有机碳积累量和干重均显著高于龙特甫B,但开花后则显著低于龙特甫B。这些结果说明黄玉B的碳代谢具有开花前旺盛而开花后缓慢的特性,很大程度上不同于龙特甫B。本研究揭示了黄玉B农艺性状和单株产量表现的碳代谢成因,为其生产应用提供了理论依据。

A xanthan rice mutant ‘Huangyu B＇ and its wild type parent‘ Longtefu B＇ were field grown and measured for physiological indexes related to carbon metabolism, such as the content of photosynthetic pigment and soluble sugar, the activity of RuBPCase, sucrose synthetase （SS） and sucrose phosphate synthase （SPS） in leaves, the dry weight and organic carbon accumulation per plant at different developmental stages. Compared with ‘ Longtefu B＇, total photosynthetic pigment content decreased and the value of Chla/b and Car/Chl increased significantly. At tillering stage the soluble sugar content and the activity of RuBPCase, SS and SPS of ‘ Huangyu B＇ were significantly higher than that of ‘Longtefu B＇ , while at flowering stage they were significantly lower. The organic carbon accumulation and dry weight per plant of ‘Huangyu B＇ were significantly higher before flowering, but significantly lower at mature stage than that of‘Longtefu B＇. These results indicated that ‘ Huangyu B ＇ was more vigorous before flowering and slower after flowering in carbon metabolism, which is quiet different from ‘ Longtefu B＇. The results reveal the cause in carbon metabolism for the performance of agronomic traits and yield per plant of Huangyu B, and provide a theoretical basis for its production application.