青贮玉米秸秆中性洗涤纤维与蔗糖合成酶活性之间的关系

以10个秸秆中性洗涤纤维(NDF)含量差异明显的青贮玉米杂交组合为材料,测定了抽雄后25天时叶片的蔗糖合成酶活性与蔗糖含量。通过对中性洗涤纤维(NDF)含量、蔗糖合成酶活性与蔗糖含量三者间相关性分析的结果显示,在抽雄后25天时,不同青贮玉米组合的秸秆NDF含量与蔗糖合成酶活性及蔗糖含量均成极显著负相关。验证了在玉米中蔗糖合成酶是作为纤维素合成的关键酶,它是通过将蔗糖分解为UDPG作为纤维素合成的直接底物。同时也为改善青贮玉米NDF含量,育成低纤维高品质青贮玉米品种提供理论依据。

The Relationship between Stalks NDF Content and Activities of Sucrose Synthase in Silage Maize

Abstract: To research the relationship of SS (sucrose synthtase) activity of the growth period of corn silage and stalk NDF content of silage corn, 10 silage corn hybrids which have significant differences in stalk NDF content are chose as the experimental material. Our study provides a theoretical basis for improvement of NDF content and cultivating low-fiber and high-quality varieties of corn silage. The results showed, there is a negative correlation between the stalk NDF content and SS activity. All of these are consistent with the hypothesis about SS as a key enzyme in the synthesis of cellulose, just because it provides the substrate for synthesis of cellulose, through decomposing sucrose into UDPG.