首页|Changes in Enzyme Activities Involved in Starch Synthesis and Hormone Concentrations in Superior and Inferior Spikelets and Their Association with Grain Filling of Super Rice

Changes in Enzyme Activities Involved in Starch Synthesis and Hormone Concentrations in Superior and Inferior Spikelets and Their Association with Grain Filling of Super Rice

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
  • 维普
The changes in activities of key enzymes involved in sucrose-to-starch conversion and concentrations of hormones in superior and inferior spikelets of super rice were investigated and their association with grain filling was analyzed.Four super rice cultivars,Liangyoupeijiu,Ilyou 084,Huaidao 9 and Wujing 15,and two high-yielding and elite check cultivars,Shanyou 63 and Yangfujing 8,were used.The activities of sucrose synthase (SuSase),adenosine diphosphoglucose pyrophosphorylase (AGPase),starch synthase (StSase) and starch branching enzyme (SBE),and the concentrations of zeatin + zeatin riboside (Z + ZR),indole-3-acetic acid (IAA) and abscisic acid (ABA) in superior and inferior spikelets were determined during the grain filling period and their relationships with grain filling rate were analyzed.Maximum grain filling rate,the time reaching the maximum grain-filling rate,mean grain filling rate and brown rice weight for superior spikelets showed a slight difference between the super and check rice cultivars,but were significantly lower in the super rice than in the check rice for inferior spikelets.Changes of enzyme activities and hormone concentrations in grains exhibited single peak curves during the grain filling period.The peak values and the mean activities of SuSase,AGPase,StSase and SBE were lower in inferior spikelets than in superior ones,as well as the peak values and the mean concentrations of Z + ZR and IAA.However,the peak value and the mean concentration of ABA were significantly higher in inferior spikelets than in superior ones and greater in the super rice than in the check rice.The grain filling rate was positively and significantly correlated with the activities of SuSase,AGPase and StSase and the concentrations of Z + ZR and IAA.The results suggested that the low activities of SuSase,AGPase and StSase and the low concentrations of Z + ZR and IAA might be important physiological reasons for the slow grain filling rate and light grain weight of inferior spikelets in super rice.

super ricesuperior spikeletinferior spikeletenzyme activityhormone concentrationgrain filling

FU Jing、XU Yun-ji、CHEN Lu、YUAN Li-min、WANG Zhi-qin、YANG Jian-chang

展开 >

Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China

grants from the National Natural Science Foundation of ChinaGeneral ProjectGeneral ProjectNational Basic Research ProgramNational Key Technology Support Program of ChinaNational Key Technology Support Program of ChinaBasic Scientific Research Special Operation Cost of the Central Research Institutions in 2011

NSFC-IRRI Joint Research Project 3106114045731071360312716412009CB1186032011BAD16B142012BAD04B08201103003

2013

10.1016/S1672-6308(13)60116-X

水稻科学(英文版)
中国水稻研究所

水稻科学(英文版)

CSTPCD
影响因子：0.269
ISSN：1672-6308
年,卷(期)：2013.20(2)
  • 8
  • 4