【摘要】 以中国水稻研究所通过伽马射线照射选育的低纤维基因突变体水稻(嫩稻Nendao)与亲本双科早(Shuang-kezao)为研究试材,分析水稻抽穗后的细胞壁纤维构成生物学动态发育与特点。在相同种植条件下,低纤维基因突变体选育的嫩稻表现出较强的营养体生长优势,收获期叶、鞘、茎生物产量分别较亲本提高27.77%、30.19%和37.96%。与亲本相比,嫩稻稻草的细胞壁纤维素含量明显降低(-23.9%),而细胞壁在动态发育过程中,通过自我补偿能力,提高半纤维素(11.94%)、木质素(8.79%)与硅化物(5.60%)组分的构成含量,以完成对细胞的保护功能作用。此外,低纤维基因嫩稻稻草收获时的粗蛋白含量较亲本稻草提高20.71%,而其中可溶解蛋白比率提高63.49%。研究表明,低纤维基因嫩稻具备了较好的饲料稻品种资源特点。更多还原

【Abstract】 The differences between low fiber mutant rice (LF, Nendao), selected through gamma-ray (γ), and itsparental variety Shuangkezao (CK) were compared in their biological development and cell wall composition after riceheading stage. Compared with parental rice, LF rice showed an advantage in its vegetative growth and the yields of leaf,sheath and stem increased by 27.77%, 30.19% and 37.96% respectively. The cellulose content of LF rice straw decreasedremarkably by 23.9%; the hemicellulose, lignin and biogenic silicon contents increased by 11.94%, 8.79% and 5.60%respectively. Moreover, the crude protein content increased by 20.71% in LF rice and with an improvement of its solubilityby 63.49% concomitantly. The results indicated that the low fiber mutant rice exhibited its potential as a fodder-rice varietyor as a dual-purpose rice with improved fiber degradability of straw.更多还原