Chinese Journal OF Rice Science >
Effects of Root-cutting Treatment on Growth and Physiological Characteristics of Hybrid Rice at Different Seedling-ages
Received date: 2016-04-01
Revised date: 2016-05-17
Online published: 2016-11-10
Supper hybrid rice F you 498 was used to investigate the effects of seedling-age (25 days old and 40 days old) and root-cutting (1/3, 2/3 and the whole root were cut off with no root-cutting as control) on the root response 0-48 hours and 1-29 days after root cutting, as well as dynamics of biomass accumulation, root morphology and nitrogen (N) absorption in a hydroculture experiment. The results showed that rice seedlings at various seedling ages responsed diversely to root-cutting. The proline content and soluble sugar content of the above-ground part had a significant peak after root-cutting, which was higher and reached the peak value in shorter time with the increase of the root-cutting ratio. The physiological resistance and resilience after root-cutting of 25-day seedling-age were superior to that of 40-day old seedling. In the views of root-cutting ratio, 1/3 root-cutting had positive effect on seedling growth. Compared to the control, the root length, root surface area, above-ground biomass, root biomass, nitrogen accumulation amount and root shoot ratio were higher 22 days after 1/3 root-cutting for 25-day old seedling. However, the root surface area in the whole growth stage decreased with the increaing root-cutting ratio for 40-day old seedling. The root-shoot ratio was higher than that of control 22 days after 1/3 root-cutting, and the above-ground biomass, root length, nitrogen accumulation amount and nitrogen content were also higher than those of control 29 days after 1/3 root-cutting. Besides, the root damage might inhibite the seedling growth and restrain the absorption of nutrients, which could affect the growth and development of rice seedling.
Key words： hybrid rice; seedling-age; root-cutting; physiological characteristics
Ying-hong LI, Hai-yue WANG, Feng-jun YAN, Na LI, Yong-jian SUN, Zou DAI, Hua-ying XIE, Jun MA . Effects of Root-cutting Treatment on Growth and Physiological Characteristics of Hybrid Rice at Different Seedling-ages[J]. Chinese Journal OF Rice Science, 2016 , 30(6) : 626 -636 . DOI: 10.16819/j.1001-7216.2016.6057
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