Investigation on agronomic characters of dwarf mutant in Panicum miliaceuml and analysis of its sensitivity to GA

doi:10.3969/j.issn.1004-1524.2019.05.02

›› 2019, Vol. 31 ›› Issue (5): 688-694.DOI: 10.3969/j.issn.1004-1524.2019.05.02

• Crop Science • Previous Articles Next Articles

Investigation on agronomic characters of dwarf mutant in Panicum miliaceuml and analysis of its sensitivity to GA

ZHANG Bo¹, JIA Xiaoping^1,*, YANG Dezhi², ZHAO Yuan¹, DAI Lingfeng¹, KOU Shujun², ZHANG Xiaomei¹, HOU Dianyun¹, ZHU Xuehai^2,*

1. College of Agronomy, Henan University of Science and Technology, Luoyang 471000, China;
2. Zhangjiakou Academy of Agricultural Sciences, Zhangjiakou 075000, China

Received:2018-11-20 Online:2019-05-25 Published:2019-05-23

Abstract

Abstract: In order to investigate the difference between agronomic traits of dwarf mutant and original material of Panicum miliaceuml and whether the cause of dwarf was related to gibberellin (GA) synthesis or signaling pathway, the dwarf mutant 778 and its original material high straw 260 were used as experimental materials. Morphological observation and determination of agronomic traits in plant height, ear length, internode length, internode number, seed length, seed width and number of seeds were determined. Then, the plants were treated by different concentrations of GA in different growth periods, and the changes of plant height, root length, stem width, leaf length and leaf width were measured. The results showed that the plant height of the dwarf mutant material was significantly different from that of the original high straw material, which was mainly caused by the difference between the base of the ground and the length of the first and second elongation joints. Comparing and analyzing the differences of traits between dwarf mutant material 778 and original high straw material 260, it was found that the plant height, ear length, internode number, grain number per ear and internode length of dwarf mutant 778 were significantly lower than that of high straw 260 (P<0.01), the seed length of dwarf mutant 778 was significantly higher than that of high straw 260 (P<0.05). Different concentrations of gibberellin (0, 50, 100, 200 mg·L^-1) had no significant effect on plant height and root length of scorpion dwarf mutant 778 (P>0.05), but different concentrations of gibberellin had significant effects on plant height, root length and GRI value of high straw 260 (P<0.05). And the plant morphology and growth potential of high straw 260 treated with different concentrations of gibberellin were superior to the control group. Under the condition of 100 and 200 mg·L^-1 GA, the difference in plant height between the dwarf mutant and the high straw material decreased with time, and there was no difference at the end. There was no difference in GRI value between different concentrations of gibberellin treatments, indicating that the external gibberellin could restore the scorpion dwarf mutant to the original high straw, and the gene that caused the mutation may be related with the gibberellin synthesis pathway.

Key words: Panicum miliaceuml, dwarf mutant, agronomic traits, GA, dwarf pathway

CLC Number:

S516

ZHANG Bo, JIA Xiaoping, YANG Dezhi, ZHAO Yuan, DAI Lingfeng, KOU Shujun, ZHANG Xiaomei, HOU Dianyun, ZHU Xuehai. Investigation on agronomic characters of dwarf mutant in Panicum miliaceuml and analysis of its sensitivity to GA[J]. , 2019, 31(5): 688-694.

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Investigation on agronomic characters of dwarf mutant in Panicum miliaceuml and analysis of its sensitivity to GA

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