Effects of Euphorbia jolkinii on physiology and endogenous hormone content of alfalfa seedlings

doi:10.11686/cyxb2022455

Abstract

Abstract:

This research explored the effects of allelochemicals in Euphorbia jolkinii on alfalfa （Medicago sativa）seedlings using an indoor controlled experiment with the aim of providing information to support the replanting of improved forage species and restoration of degraded grassland where the poisonous herb has spread. We determined the effects of E. jolkinii on the morphology， physiology and endogenous hormone content of alfalfaseedlings. It was found that the addition of E. jolkinii reduced seedling root activity initially， and then blocked the synthesis of chlorophyll， gibberellic acid （GA）， zeatin （ZT） and indoleacetic acid （IAA）， with the ultimate effect of significant inhibition of alfalfa seedling growth. The addition of soil from the root zone of E. jolkinii plants promoted the synthesis of chlorophyll and improved the root activity of alfalfa on the one hand， and reduced the synthesis of GA， ZT， and IAA on the other hand， with the overall result was that there was no significant effect on the growth index of alfalfa seedlings in terms of seedling root length and fresh weight in treatments where root-zone soil was added. In summary， the allelochemicals contained in E. jolkinii can strongly inhibit the hormone synthesis of alfalfa seedlings， and thereby inhibit the growth of alfalfa seedlings but some amelioration through inoculation with E. jolkinii root-zone soil is possible.

Key words: Euphorbia jolkinii, alfalfa, seedling morphology, antioxidant enzymes, endogenous hormone, allelopathic effect

Gui-lian SHAN, Zu-yan MA, Jia-yi LI, Yang LIU, Yong XIE, Jia LIU, Xiao-hui CHU. Effects of Euphorbia jolkinii on physiology and endogenous hormone content of alfalfa seedlings[J]. Acta Prataculturae Sinica, 2023, 32(10): 153-161.

Figures/Tables 8

Fig.1 Effects of E. jolkinii crushed materials on alfalfa morphology

Fig.2 Synthetical effects of E. jolkinii crushed materials on alfalfa morphology

Fig.3 Effects of E. jolkinii crushed materials on alfalfa chlorophyll contents

Fig.4 Effects of E. jolkinii crushed materials on alfalfa root activity

Fig.5 Effects of E. jolkinii crushed materials on alfalfa antioxidant enzymes activity

Fig.6 Synthetical effects of E. jolkinii crushed materials on alfalfa physiology

Fig.7 Effects of E. jolkinii crushed materials on alfalfa endogenous hormone contents

Fig.8 Synthetical effects of E. jolkinii crushed materials on alfalfa endogenous hormones

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