作物学报2009，Vol.35Issue(12)：2225-2233,9.DOI:10.3724/SP.J.1006.2009.02225
超级稻花后强、弱势粒多胺浓度变化及其与籽粒灌浆的关系
Post-Anthesis Changes in Concentrations of Polyamines in Superior and Inferior Spikelets and Their Relation with Grain Filling of Super Rice
摘要
Abstract
Success in super rice breeding has been considered a great progress in rice production in China. However, many unfilled inferior spikelets limit the realization of great yield. As polyamines have been frequently described as endogenous plant growth regulators or intracellular messengers mediating physiological processes, this study investigated whether and how polyamines are involved in the regulating post-anthesis development of rice spikelets. Four super rice cultivars, Liangyoupeijiu and II you 084 (indica hybrids), Huaidao 9 and Wujing 15 (japonica), and two high-yielding check cultivars, Shanyou 63 (indica hybrid) and Yangfujing 8 (japonica), were field grown. Concentrations of putrescine (Put), spermidine (Spd) and spermine (Spm) in both inferior and superior spikelets during the grain filling period and grain filling rate were determined. The relationship between polyamine concentrations and grain filling rate were analyzed, and chemical regulators were applied to verify the roles of polyamines in grain filling. The results showed that the maximum grain filling rate, mean grain filling rate, and brown rice weight for superior spikelets showed small difference between the super rice and check rice, but those of inferior spikelets were significantly lower for super rice than for check rice cultivars. Changes in concentrations of polyamines in grains exhibited single peak during the grain filling period. The peak and mean concentrations of Put were greater in inferior than in superior spikelets. The peak and mean concentrations of Spd and Spm were greater in the superior than in the inferior, and greater in the check rice than in the super rice. The mean grain filling rate and brown rice weight were negatively and very significantly correlated with the Put concentrations, and positively and very significantly correlated with Spd and Spm concentrations, Spd/Put, and Spm/Put. Application of Spd or Spm to panicle at the early grain filling stage significantly enhanced activities of sucrose synthetase, adenine di-phosphoglucose pyrophosphorylase, and soluble starch synthetase in inferior spikelets, and significantly increased grain filling rate, seed setting rate and grain weight of inferior spikelets. Application of Put or methylglyoxal-bis (guanylhydrazone) (MGBG, an inhibitor of 5-adenosyl-Z.-methionine decarboxylase) exhibited an opposite effect. The results suggest that polyamines play a role in regulating grain filling. Low concentrations of Spd and Spm and low Spd/Put and Spm/Put may be an important physiological reason for the small grain filling rate and low grain weight of inferior spikelets in super rice.关键词
超级稻/强势粒/弱势粒/多胺/结实率/灌浆速率Key words
Super rice/ Superior spikelet/ Inferior spikelet/ Polyamine/ Seed setting rate/ Grain filling rate分类
农业科技引用本文复制引用
谈桂露,张耗,付景,王志琴,刘立军,杨建昌..超级稻花后强、弱势粒多胺浓度变化及其与籽粒灌浆的关系[J].作物学报,2009,35(12):2225-2233,9.基金项目
本研究由国家自然科学基金项目(30771274),国家科技攻关计划项目(2006BAD02A13-3-2),江苏省冉然科学基金项目(BK2009005),2008年中央级科研院所基本科研业务费专项基金(农业)(200803030)和教育部高等学校博士学科点专项科研基金项目(200811170002)资助. （30771274）
