Effects of Rhizosphere Oxygen Concentration on Rooting Ability of
Machine-Transplanted Rice Seedling Before 3-leaf Stage
Jing Chen1*, Chaoyun Wang2, Yongjian Yi2, Hongying Wang2, Wanlai Zhou1,3 and Zhenxie Yi1
1College of Agronomy, Hunan Agricultural University, Changsha, China
2Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China
3Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
*Corresponding Author: Jing Chen, College of Agronomy, Hunan Agricultural University, Changsha, China.
September 23, 2021; Published: November 25, 2021
Rooting ability is an important trait that represents the quality of machine transplanted rice seedling. It is closely associated with the soluble sugar content in seedling and rhizosphere oxygen concentration may have a significant effect on rooting ability of rice seedling before 3-leaf stage. In this study, we used rice seedlings before 3-leaf stage as materials. The growth, soluble sugar content and rooting ability of rice seedlings under low oxygen (0.1 - 1 mg·L-1, LO), medium oxygen (4 - 5 mg·L-1, MO), and high oxygen (7 - 8 mg·L-1, HO) were investigated. The results showed that oxygen concentration had a significant effect on dry matter weight of rice seedlings and the differences among treatments varied as the leaf age increased. In all leaf ages, rice seedlings in MO had the lowest shoot soluble sugar content and the highest root soluble sugar content. At 1-leaf stage, the total length of new roots in the low oxygen treatment (LO) was 3.86 cm and 5.78 cm longer than that in MO and high oxygen (HO), respectively; and the number of new roots in LO was 0.83 and 0.87 higher than that in MO and HO, respectively. However, at 3-leaf stage, the total length of new roots in MO was 3.33 cm longer than that in LO, while that in LO was 3.18 cm longer than in the HO. Our study showed that when the duration is longer than one leaf age, rice seedlings under medium oxygen concentration had the strongest rooting ability. Like LO stress, HO treatment may also be a type of stress to rice seedlings, and its adverse effect on rice seedlings gradually appeared with prolonged treatment duration. This study can provide guidance for cultivating rice seedlings with high rooting ability based on rhizosphere oxygen concentration regulation.
Keywords: Rice; Rooting ability; Soluble Sugar; Hypoxia; Hyperoxia
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