水稻籽粒中内源多胺及其与籽粒充实和粒重的关系

以８个水稻品种（含杂交稻组合）为材料，研究了籽粒发育期内源多胺的含量及其与籽粒充实和粒重的关系。结果表明：籽粒中Ｐｕｔ（腐胺）、Ｓｐｄ（亚精胺）和Ｓｐｍ（精胺）的含量，强势粒高于弱势糕卫粒充实好的品种（组合）高于籽粒充实差的品种（组合），尤以Ｓｐｄ和Ｓｐｍ更明显；籽闰中Ｓｐｄ和Ｓｐｍ的含量或浓度，以及Ｓｐｄ／Ｐｕｔ和Ｓｐｍ／Ｐｕｔ的比值与谷粒充实率和千粒軎于极显著正相关在花后３天喷施外源多胺（１ｍ

Polyamines in Rice Grains and Their Relations with Grain Plumpness and Grain Weight

Using 8 rice varieties (including hybrid combinations) as materials, polyamines in developing grains and their relations with grain plumpness and grain weight were studied. The results showed that a) , the content of Put(putrescine), Spd(spermidine) and Spm (spermine) , especially Spd and Spm, was higher in strong potential grains than in weak potential ones, and higher in the varieties with high grain plumpness than in those with low grain plumpness; the content or concentration of Spd and Spm in grains, and values of Spd/Put and Spm/Put were very significantly correlated with grain-filling percentage and 1000-grain weight; and b), spraying exogenous polyamines(1mmol/L Spd or 0. 5 mmol/L Spm) on the third day after anthesis increased Spd and Spm content in grains, endosperm cells, grain plumpness and grain weight; however, the results were reversed when polyamine synthesis inhibitor MGBG was used. It is suggested that polyamines, especially Spd and Spm, play an important role in grain filling and grain-weight increase.