Effect of Two Allelochemicals of Casuarina Equisetifolia on Dynamic Change of Root Activity and Endogenous Hormone of Its Seedling Under Hydroponic Cultivation
Clones of 'Huian No.1' Casuarina equisetifolia were grown in water to investigate the effects of root activity and content of endogenous hormone in root under allelochemicals stress induced by quercetin -3 -α -araboside (allelochemical A) and quercetin-3-β-glucoside (allelochemical B) for 15 d with seven concentrations: 0, 12.S, 25, 50, 100, 200 and 400 mg/L. The experimental results indicated that: the root activity and the content of gibberellin (GAS) and heteroauxin (IAA) were significantly decreased and the content of abscisic acid (ABA) were significantly increased to the concentration of allelochemicals over the time course except the root activity in 12.5 mg/L of allelochemical A treatment, which decreased after increment. Under the same disposal in the same time course, allelochemical A had higher root active and content of GAs, IAA and ABA than allelochemical B. All results indicated that the seedlings of C. equisetifolia under allelochemical A stress had better stress tolerance than the seedlings under allelochemical B stress. The seedlings of C. equisetifolia could tolerate against allelochemiacl A damage induced by slight (12.5 mg/L) stress at the early stage (5 d). The allelochemical B had bigger damage on the function of the seedlings of Casuarina equisetifolia.
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维普
