关键词:籼粳杂交稻; 灌浆结实期; 不同低温; 激素 Effect of Low Temperature after Flowering on Grain Filling and Plant Hormones Contents in Rice ZENG Yan-Hua1,2,**, ZHANG Yu-Ping2,**, PAN Xiao-Hua1, ZHU De-Feng2,*, XIANG Jing2, CHEN Hui-Zhe2 1Collaborative Innovation Center for the Modernization Production of Double Cropping Rice, Jiangxi Agricultural University / Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education / Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Nanchang 330045, China;
2State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 311400, China
Fund:This study was supported by the China Agriculture Research System (CARS-01-09B), Zhejiang Province Natural Science Foundation (Y13C130013), the Jiangxi Key Technology R&D Program (20123BBF60167), and the Doctor Activation Fundamental Research Funds for Jiangxi Agricultural University (9032305504) AbstractLow temperature (LT) after flowering impacts greatly on grain filling, decreasing rice quality through extended filling duration, shortened filling rate, and decreased physiological activity. Indica-japonica hybrid rice has been applied widely in production practice, due to high yield potential. However, there has been little study on the effect of LT on endogenous hormones in indica-japonica hybrid cultivars at filling stage. In the study, four varieties, i.e. two indica-japonica hybrid rice (Yongyou 538, YY538; Yongyou 17, YY17), one indica rice (Zhongzheyou 1, ZZY1) and one japonica rice (Zhejing 88, ZJ88), were treated with those low temperature treatments at different grain filling phases, to compare endogenous hormone levels in treatments, aiming to reveal the influence of low temperature on grain filling and the response of endogenous hormone in grains to low temperature. The effect of LT on grain filling after different flowering stage appeared significantly at early grain filling stage, while a little difference was observed at later filling stage, compared with CK. Furthermore, the influence on grain filling was found higher in Yongyou 17 and Zhongzheyou 1 than in Yongyou 538 and Zhejing 88. Compared with the contract, LT after flowering at early stage significantly decreased grain filling and prolonged grain filling duration in Yongyou 17, but not in Yongyou 538. Based on the effect of LT on grain filling process and its relation with endogenous hormones contents, it might be deduced that the normal grain filling should be ascribed to the significantly reduced GA3 content and the slightly increased IAA, ZR contents in developing grains of Yongyou 538 at early and middle grain-filling stage. On the contrary, the significantly reduced IAA, ZR contents and the significantly increased GA3, ABA contents in Yongyou17 could restrain grain development. It should enhance grain filling of rice encounted LT by selected measures adjusting hormone in practice management.
Keyword: Indica-japonica hybrid rice; Grain-filling stage; Different low temperature; Hormones Show Figures Show Figures
图1 灌浆期温度处理下不同品种籽粒重量动态变化S1、S2、S3为花后灌浆前、中、后期时段的低温处理。Fig. 1 Dynamics of grains weight of varieties at grain-filling stageS1, S2, S3 indicate low temperature from 0 to 15 days, from 15 to 30 days, and from 30 days after flowering to maturity, respectively.
表1 Table 1 表1(Table 1)
表1 灌浆期温度处理下籽粒灌浆过程的Richards方程参数 Table 1 Parameters of Richards equation for grain filling
品种 Variety
处理 Treatment
A
B
K
N
R2
中浙优1号 Zhongzheyou 1
CK
25.38 a
1.87
0.14
0.45
0.999
S1
24.75 c
1894.44
0.29
3.09
0.998
S2
25.12 bc
0.31
0.11
0.12
0.997
S3
25.20 b
2.08
0.14
0.48
0.999
甬优17 Yongyou 17
CK
23.98 a
10.60
0.20
1.03
0.999
S1
23.09 c
327747.90
0.46
5.22
0.996
S2
23.23 bc
1.93
0.15
0.44
0.996
S3
23.32 b
18.90
0.23
1.28
0.999
甬优538 Yongyou 538
CK
20.05 a
16.70
0.16
1.18
0.998
S1
20.05 a
11.62
0.14
1.03
0.998
S2
20.04 a
16.88
0.16
1.19
0.998
S3
20.07 a
19.29
0.17
1.24
0.998
浙粳88 Zhejing 88
CK
26.24 a
455.22
0.22
2.76
0.999
S1
26.10 a
430.14
0.22
2.56
0.999
S2
26.29 a
257.37
0.21
2.47
0.999
S3
26.28 a
175.36
0.19
2.30
0.999
A indicates final grain weight; B, K, and N indicate equation parameters of Richards; R2 indicates determination coefficient. Values followed by different letters are significantly different at the 0.05 probability level. S1, S2, S3 indicate low temperature from 0 to 15 days, from 15 to 30 days, and from 30 days after flowering to maturity, respectively. A为籽粒最终重量(mg); B、K和N为Richards方程参数; R2为决定系数。标以不同字母的值在5%水平上差异显著。S1、S2、S3为花后灌浆前、中、后期时段的低温处理。
表1 灌浆期温度处理下籽粒灌浆过程的Richards方程参数 Table 1 Parameters of Richards equation for grain filling
图2 灌浆期温度处理下不同品种籽粒灌浆速率变化S1、S2、S3为花后灌浆前、中、后期时段的低温处理。Fig. 2 Dynamics of grain filling rate of varieties in low temperature treatmentsS1, S2, S3 indicate low temperature from 0 to 15 days, from 15 to 30 days, and from 30 days after flowering to maturity, respectively.
图3 灌浆期低温对籽粒IAA含量的影响LT: 低温处理, 包括花后灌浆前期第7、第14天, 灌浆中期第21、第28天, 灌浆后期第35天。Fig. 3 Effect of low temperature during grain-filling on IAA content in rice grains“ LT” indicates the seventh and fourteenth days, the twenty-first and twenty-eighth days, and the thirty-fifth day after flowering, respectively in low temperature treatment.
图4 灌浆期低温对籽粒ZR含量的影响LT: 低温处理, 包括花后灌浆前期第7、14天, 灌浆中期第21、28天, 灌浆后期第35天。Fig. 4 Effect of low temperature during grain-filling on ZR content in rice grains“ LT” indicates the seventh and fourteenth days, the twenty-first and twenty-eighth days, and the thirty-fifth day after flowering, respectively in low temperature treatment.
图5 灌浆期低温对籽粒GA3含量的影响LT: 低温处理, 包括花后灌浆前期第7、第14天, 灌浆中期第21、第28天, 灌浆后期第35天。Fig. 5 Effect of low temperature during grain-filling on GA3 content in rice grains“ LT” indicates the seventh and fourteenth days, the twenty-first and twenty-eighth days, and the thirty-fifth day after flowering, respectively in low temperature treatment.
图6 灌浆期低温对籽粒ABA含量的影响LT: 低温处理, 包括花后灌浆前期第7、14天, 灌浆中期第21、28天, 灌浆后期第35天。Fig. 6 Effect of low temperature during grain-filling on ABA content in rice grains“ LT” indicates the seventh and fourteenth days, the twenty-first and twenty-eighth days, and the thirty-fifth day after flowering, respectively in low temperature treatment.
表2 花后不同温度处理下水稻籽粒灌浆与籽粒中内源激素含量变化的相关分析 Table 2 Correlation coefficients between grain filling and changes of endogenous hormone contents in different temperature treatments
指标 Index
IAA
ZR
GA3
ABA
籽粒灌浆 Grain filling
IAA
1.000
ZR
-0.185
1.000
GA3
-0.266
0.461* *
1.000
ABA
0.300
0.601* *
0.390*
1.000
籽粒灌浆 Grain filling
0.189
-0.843* *
-0.683* *
-0.684* *
1.000
* P < 0.05, * * P < 0.01.
表2 花后不同温度处理下水稻籽粒灌浆与籽粒中内源激素含量变化的相关分析 Table 2 Correlation coefficients between grain filling and changes of endogenous hormone contents in different temperature treatments
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