外源H_(2)S对番茄双断根嫁接砧木及嫁接苗生长的影响

Effects of Exogenous H_(2)S on Growth of Tomato Double-root-cutting Grafted Rootstocks and Seedlings

为筛选出适宜番茄双断根嫁接砧木根系再生及嫁接苗生长的硫化氢(H_(2)S)浓度,以金钻为砧木,以粉都金冠王为接穗,研究不同浓度NaHS(0.1、0.2、0.3、0.4、0.5 mmol·L^(-1),H_(2)S供体)对双断根番茄砧木及嫁接苗生长、根系形态的影响。结果表明,0.2 mmol·L^(-1) NaHS处理的断根番茄砧木株高、茎粗、叶面积、单株鲜质量和干质量、再生根系活力均达到最大值,且显著提高了砧木内源H_(2)S含量及D-半胱氨酸脱巯基酶(DCD)活性;亦显著促进了双断根嫁接苗的生长及根系发育。

In order to select proper concentration of hydrogen sulfide(H_(2)S)suitable for root regeneration and growth of double-root-cutting grafted tomato seedling,this paper took‘Jinzuan’as rootstock and‘Fendujinguanwang’as scion;and studied the effects of different concentrations of NaHS(0.1,0.2,0.3,0.4,0.5 mmol·L^(-1),donor of H_(2)S)solutions on growth and root system morphology of tomato double-rootcutting grafted rootstocks and seedlings.The results showed that seedlings treated with 0.2 mmol·L^(-1) NaHS all reached the maximum value in plant height,stem diameter,leaf area,dry and fresh single plant weight and regenerative root activity of root-cutting rootstocks;and also significantly increased the endogenous H_(2)S content,activity of D-cysteine desulfhydrase(DCD)of rootstock.Meanwhile,0.2 mmol·L^(-1) NaHS could notably promote the growth and root system development of double-root-broken tomato grafted seedlings.