[1]CHEN Keli,MENG Min,ZHANG Peng,et al.Effects of Rainfall Gradients on the Distribution Pattern and Growth of Endogenous Hormones in Different Organs of Robinia pseudoacacia on the Loess Plateau[J].Research of Soil and Water Conservation,2020,27(01):298-304.
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Effects of Rainfall Gradients on the Distribution Pattern and Growth of Endogenous Hormones in Different Organs of Robinia pseudoacacia on the Loess Plateau
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 01
Page number:
298-304
Column:
Public date:
2020-02-20
- Title:
- Effects of Rainfall Gradients on the Distribution Pattern and Growth of Endogenous Hormones in Different Organs of Robinia pseudoacacia on the Loess Plateau
- CLC:
- S719
- DOI:
- -
- Abstract:
- How environmental gradients affect the distribution pattern of endogenous hormones in different organs of trees, and how the changes in endogenous hormone patterns affect the allometric growth of different organs of trees are still not very clear. This study selected different rainfall gradients of Shenmu(440.8 mm/a), Suide(475.4 mm/a), Ansai(505.1 mm/a)and Chunhua(606.1 mm/a)in the Loess Plateau. Robinia pseudoacacia’s leaves, branches and roots of different diameters(the finest root(0～1 mm), fine root(1～2 mm), coarse root(2～5 mm))content and their effect on organ growth were compared. The results showed that:(1)with the increase of rainfall, the contents of zeatin nucleoside(ZR)and gibberellic acid(GA3)increased, and the content of abscisic acid(ABA)decreased in all organs; the ratio of different diameter roots w(ZR+ GA3+IAA)/w(ABA), w(GA3)/w(ABA), w(ZR)/w(ABA), w(IAA)/w(ABA)increased, but the growth of different organs was inconsistent; in Chunhua area, the GA3 contents in the leaves, branches, finest roots, fine roots and coarse roots of the locusts were 55%, 21%, 274%, 376% and 279% higher than those in Shenmu area;(2)the average annual accumulation of the organs of Robinia pseudoacacia in Ansai and Chunhua areas with relatively high rainfall was significantly higher than that in Suide and Shenmu areas with relatively low rainfall (p<0.05);(3)the contents of root growth-promoting hormones(ZR, GA3 and IAA)are mainly affected by rainfall and soil total nitrogen(TN);(4)there is the significant positive correlation between root biomass and ZR and w(ZR)/w(ABA)content, and w(GA3)/w(ABA)and w(ZR)/w(ABA)ratios are significantly negatively correlated with shoot biomass. Along the rainfall gradient, rainfall and soil TN promote the allometric growth of the roots of Robinia pseudoacacia by promoting the contents of ZR, GA3 and IAA in roots of different diameter classes.
- References:
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Last Update:
2020-02-25