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Acta Agronomica Sinica ›› 2019, Vol. 45 ›› Issue (9): 1446-1453.doi: 10.3724/SP.J.1006.2019.83078

• RESEARCH NOTES • Previous Articles    

Grain filling, dehydration characteristics and changes of endogenous hormones of summer maize hybrids differing in maturities

WAN Ze-Hua,REN Bai-Zhao,ZHAO Bin,LIU Peng,ZHANG Ji-Wang()   

  1. State Key Laboratory of Crop Biology/Agronomy College, Shandong Agricultural University, Tai’an 271018, Shandong, China
  • Received:2018-11-25 Accepted:2019-05-12 Online:2019-09-12 Published:2019-05-31
  • Contact: Ji-Wang ZHANG E-mail:jwzhang@sdau.edu.cn
  • Supported by:
    This study was supported by the State Key Research and Development Program “Food Production Enhancement and Efficiency Innovation” Key Special Project(2017YFD0300304-02);the China Agriculture Research System(CARS-02-18)

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Abstract:

This study was expected to explore the relation of grain-filling and dehydration characteristics with changes of endogenous hormones of summer maize hybrids differing in maturities, providing theoretical references for mechanized harvest of grains, high-yield, high-efficiency production and breeding of summer maize hybrids in the Huang-Huai-Hai Rivers region. The early maturity hybrids Denghai 518 (DH518), Hengzao 8 (HZ8) and the late maturity hybrids Zhengdan 958 (ZD958), Denghai 605 (DH605) were used to measure changes of dry matter accumulation, water content and endogenous hormone content in the process of kernel formation. Compared with the late maturity hybrids, the early maturity hybrids had shorter grain-filling duration, earlier beginning of dehydration, higher dehydration rate, lower kernel weight at physiological maturity stage, and lower yield. but among the early maturity hybrids, DH518 had significantly higher yield than HZ8. The endogenous hormones content and their changes in different hybrids were different, but the trend that the same hormone changed with grain development was the same. The ABA content of the early maturity hybrids in grain was higher than that of the late maturity hybrids, especially in the middle-late grain-filling stage. Both grain filling and dehydration rate were related to endogenous hormone, the dehydration rate of the early hybrids was positively correlated with ZR content.

Key words: summer maize, growth period, grain-filling, grain dehydration, endogenous hormone

Table 1

Growth process of summer maize hybrids differing in maturities"

年份
Year		 品种
Hybrid		 播种期
Sowing
(month/day)		 吐丝期
R1
(month/day)		 完熟期
R6
(month/day)		 吐丝后天数
Days after
R1 (d)		 生育期
Total growth
period (d)
2016 登海518 Denghai 518 6/11 7/28 9/23 58 105
衡早8号 Hengzao 8 6/11 7/29 9/20 54 102
郑单958 Zhengdan 958 6/11 7/31 10/2 64 114
登海605 Denghai 605 6/11 8/1 10/6 67 118
2017 登海518 Denghai 518 6/10 7/25 9/21 58 103
衡早8号 Hengzao 8 6/10 7/25 9/20 57 102
郑单958 Zhengdan 958 6/10 7/30 9/30 62 112
登海605 Denghai 605 6/10 7/31 10/1 62 113

Fig. 1

Yield of summer maize hybrids differing in maturities Bars superscripted by a different small letter are significantly different at the 0.05 probability level. DH518: Denghai 518; HZ8: Hengzao 8; ZD958: Zhengdan 958; DH605: Denghai 605."

Fig. 2

Hundred-kernel fresh weight changes of summer maize hybrids differing in maturities after silking stage 缩写同图1。Abbreviations are the same as those given in Fig. 1."

Fig. 3

Hundred-kernel dry weight changes of summer maize hybrids differing in maturities after silking stage 缩写同图1。Abbreviations are the same as those given in Fig. 1."

Fig. 4

Change of grains moisture content of summer maize hybrids differing in maturities after silking stage 缩写同图1。Abbreviations are the same as those given in Fig. 1."

Fig. 5

Change of hundred-kernel absolute water content of summer maize hybrids differing in maturities after silking stage 缩写同图1。Abbreviations are the same as those given in Fig. 1."

Fig. 6

Changes of kernel filling and dehydration rate of summer maize hybrids differing in maturities after silking stage (2017) 缩写同图1。Abbreviations are the same as those given in Fig. 1."

Fig. 7

Hormones content changes in kernel of summer maize hybrids differing in maturities after silking stage (2017) 缩写同图1。Abbreviations are the same as those given in Fig. 1."

Table 2

Correlation analysis on grain filling rate, dehydration rate and hormones ratio of summer maize hybrids differing in maturities (2017) "

品种
Hybrid		 激素含量及其比值 Hormone content and its ratio
IAA ZR GA3 ABA ABA/ZR ABA/IAA ABA/GA3
籽粒灌浆速率
Grain filling rate		 DH518, HZ8# 0.958* 0.771 0.828 -0.737 -0.796 -0.915 -0.813
ZD958, DH605# 0.945 0.911 0.573 -0.876 -0.889 -0.910 -0.875
籽粒脱水速率
Grain dehydration rate		 DH518, HZ8# 0.854 0.987* 0.413 -0.927 -0.931 -0.840 -0.860
ZD958, DH605# 0.798 0.907 -0.002 -0.916 -0.889 -0.873 -0.705
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