两系杂交稻扬两优6号源库特征与结实特性的分析

赵步洪, 王朋, 张洪熙, 朱庆森, 杨建昌
中国水稻科学, 2006, 20(1): 65-72     追溯原文......本站官方QQ群:62473826
杂交稻; 源库特征; 籽粒充实; 酶活性
扬州大学江苏省作物遗传生理重点实验室;江苏扬州225009;2江苏省里下河地区农业科学研究所

以两系杂交稻扬两优6号和两优培九及三系杂交稻汕优63为材料,研究了源、库、流特征及其与籽粒充实的关系。 扬两优6号和汕优63的结实率、籽粒充实度和产量明显高于两优培九;扬两优6号和汕优63茎鞘物质输出率和转换率显著高于两优培九;扬两优6号和汕优63籽粒中蔗糖合成酶、腺苷二磷酸葡萄糖焦磷酸化酶、淀粉合成酶和淀粉分支酶的活性显著高于两优培九,且上述各酶的活性与籽粒最大灌浆速率、平均灌浆速率、谷粒充实度和粒重呈极显著的正相关;扬两优6号和汕优63的单位维管束和韧皮部的颖花负荷、现实产量负荷、总库容负荷显著小于两优培九,且负荷越大的组合结实率就越低,充实度也就越差。扬两优6号单位面积韧皮部的物质转运速率显著高于两优培九和汕优63。表明扬两优6号具有源足、库强、流畅的特点,这是它结实率高和籽粒充实度好的生理基础。

Analysis on Source-Sink and Grain-Filling Charact er istics of Two-Line Hybr id RiceYang liangyou 6

ZHAO Bu-hong1, 2, WANG Peng1, ZHANG Hong-x i2, ZHU Qing-sen1, YA NG Jian-chang
Chinese Journal of Rice Sciences, 2006, 20(1): 65-72
hybr id rice; sour ce- sink characteristics; grain filling; enzyme activity

With two-line hybrid r ice Yangliangyou 6 and L iangyoupeijiu and three- line hy brid r ice Shanyou 63 as materials, the relationships of source, sink and flow with grain filling w er e studied. T he seed- setting rate, grain filling deg ree and gr ain yield of Yangliangyou 6 and Shanyou 63 were sig nificantly higher than those of L iangyoupeijiu. T he export per centage and transformation percentage of the matter in culms and sheaths of Yang liang you 6 and Shanyou 63 w er e sig nificantly higher than those of Liangyoupeijiu. Activities of sucro se synthase, adenosine diphosphoglucose pyrophosphorylase, star ch sy nthase and starch branching enzyme in grains were higher in Yangliangyou 6 and Shanyou 63 than in L iangyoupeijiu, and were very significantly cor related w ith max imum grain filling rate, mean g rain filling rate, g rain filling degree and grain w eight. T he spikelet number , grain yield and total sink load per area of vascular bundle and phloem of Yangliangyou 6 and Shany ou 63 were significantly sma-l ler than those o f L iangyoupeijiu, and the g reater the load, the lower the seed-setting rate and the poorer the g rain filling. T he transportation rate per ar ea phloem of Yangliangyou 6 was gr eater than that of L iangyoupeijiu o r Shanyou 63. T he results sugg ested that Yang liang you 6 possesses strong sour ce, g reat sink activ ity and efficient flow, which lay a physio logical basis for its high seed- setting rate and good grain filling.


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