Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (29): 1-7.doi: 10.11924/j.issn.1000-6850.casb2021-0449

Special Issue: 生物技术 水稻

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Rice Germination and Seedling Growth: Responses to the Regulation of Exogenous Substances

WANG Jingdong(), HUI Jian, BAI Haibo, MA Sishuang, LI Shuhua()   

  1. The Key Lab of Agricultural Biotechnology of Ningxia, Yinchuan 750002
  • Received:2021-04-27 Revised:2021-06-13 Online:2022-10-15 Published:2022-10-14
  • Contact: LI Shuhua E-mail:wangjd2008@163.com;shuhuali@163.com

Abstract:

To clarify the morphological indexes of rice seeds during germination stage, including simple vigor index, radicle and seedling height, and their response to exogenous NaCl, IAA and CaCl2, salt-sensitive and salt-tolerant rice varieties were used as materials in this study. The germination dish method was adopted, and data were analyzed by single factor LSD multiple comparison. The results showed that under the stress of 0.1 mol/L NaCl, the simple vigor index, number of radicles, radicle length and plant height of 4 materials were lower than those of CK by 21.9%-76.5%, 20.0%-40.9%, 14.6%-55.9%, and 23.9%-36.2%, respectively. All of these indexes showed significant differences. Under salt stress, adding IAA could increase the simple vigor index of the two salt-sensitive materials by 2.6% and 13.3%, while adding CaCl2 could increase the simple vigor index of salt-sensitive materials by 9.6%-24.8%. The radicle length and plant height of salt sensitive materials were increased by 7.1%-49.0% and 14.7%-20.9%. With the CaCl2+ IAA compound treatment, the simple vigor index, number of radicles and plant height were increased by 6.9%-94.6%, 2.1%-21.2% and 9.9%-20.3%, respectively. In conclusion, the response of rice germination and seedling growth to exogenous substances is related to genotype and morphological indexes. Under salt stress, the response degree of the three indexes to exogenous CaCl2 is higher than that to IAA treatment. Furthermore, CaCl2+IAA compound treatment could effectively offset the inhibition of salt injury on rice growth.

Key words: exogenous substance, rice, simple vigor index, radicle, seedling height

CLC Number: