摘要
以粳稻武育粳 3号和杂交籼稻汕优 6 3为材料 ,研究了旱种 (地膜覆盖栽培 )水稻籽粒灌浆特性与灌浆期籽粒中激素含量的变化。与水种 (常规栽培 )相比 ,旱种水稻的粒重减轻 ,最大灌浆速率和平均灌浆速率增大 ,达到最大灌浆速率的时间提前 ,活跃灌浆期缩短 ,弱势粒尤为明显。灌浆前期籽粒中的吲哚乙酸 (IAA)、玉米素核苷 (ZR)和脱落酸 (ABA)含量 ,强势粒高于弱势粒。IAA和 ZR含量峰值出现的时间在最大灌浆速率出现值前 ,ABA含量的峰值在时间上与最大灌浆速率同步。与水种相比 ,旱种水稻籽粒中 IAA和 ZR含量减少 ,灌浆前、中期 ABA含量明显增加 ,这种差异主要表现在弱势粒上。在灌浆始期喷施 2 0× 10 - 5m ol/ L IAA,弱势粒中的 IAA和 ZR含量增加 ,ABA含量减少 ,活跃灌浆期增长 ,灌浆速率减小 ,旱种稻的粒重显著增加 ,水种稻的粒重有不同程度的降低 ;喷施 2 5× 10 - 5mol/ LABA后 ,籽粒中的激素含量、活跃灌浆期和灌浆速率与喷施 IAA的结果相反 ,旱种稻的粒重显著降低。表明旱种水稻籽粒中 ABA含量的增加或 IAA和 ZR含量的减少是灌浆期缩短和粒重减轻的生理原因 ,调节籽粒中 ABA与 IAA比值 。
With the japonica cultivar of Wuyujing 3 and indica hybrid combination of Shanyou 63 as materials, The grain filling characteristics and hormonal changes in the grains of dry cultivated rice during grain filling were investigated. Compared to moist cultivated rice (conventional cultivation), dry cultivated rice had lighter grain weight, greater grain filling rate, earlier time to reach the maximum grain filling rate and shorter active grain filling period, which was more obvious for inferior grains than for superior ones. The contents of indole 3 acetic acid(IAA), zeatin riboside (ZR) and abscisic acid (ABA) were higher in superior grains than in inferior ones at early grain filling stage. The peak of IAA and ZR contents appeared just before, and that of ABA content simultaneously with the maximum grain filling rate. The grains of dry cultivated rice contained less IAA and ZR but more ABA than those of moist cultivated rice at early and mid grain filling stages, and the differences were mainly in inferior grains. When 20×10 -5 mol/L IAA was applied to plants at the initial grain filling stage, IAA and ZR were increased and ABA was decreased in inferior grains, and active grain filing period was prolonged and grain filling rate was decreased. The grain weight of dry cultivated rice was increased and that of moist cultivated rice was decreased to a different degree by application of IAA. When 25×10 -5 M ABA was applied, the contents of hormones in grains, active grain filling period and grain filling rate were reversed with those of application of IAA, and the grain weight in dry cultivated rice was significantly reduced. The results suggest that shortened grain filling period and reduced grain weight in dry cultivated rice is attributed to an increase in ABA or decreases in IAA and ZR in the grains. Regulation of the ratio of ABA to IAA in grains would increase the grain weight in dry cultivated rice.
出处
《作物学报》
CAS
CSCD
北大核心
2002年第5期615-621,共7页
Acta Agronomica Sinica
基金
江苏省自然科学基金资助项目 (BK990 91)
国家重点基础研究发展规划项目 (G19990 1170 4)
