Phytohormones on the germination and initial growth of pumpkin seedlings under different types of water

ABSTRACT Pumpkin (Curcubita moschata Duchesne) production in quantity and quality is often restricted due to adverse environmental conditions. Thus, the objective was to evaluate the action of phytohormones as stress attenuators on the germination and initial growth of pumpkin seedlings, cv. Sergipana, under different types of water. The design adopted was completely randomized, in a 3 × 4 factorial scheme, with four repetitions. In addition to the control, the seeds were treated with the gibberellic and salicylic acids and irrigated with the supply water, fish farming wastewater, artesian well water and solution of the mixture of fish farming wastewater + artesian well water, in a 1:1 ratio. The variables evaluated were germination, first germination count, germination speed index, length of shoots and roots, dry mass of shoots and roots, soluble sugars, amino acids and proline. Treatment of pumpkin seeds, cv. Sergipana, with gibberellic and salicylic acids improved germination kinetics and attenuated the effects of water salinity during the initial growth of pumpkin seedlings.

摘要 笋瓜（Curcubita moschata Duchesne）的产量与品质常受不良环境条件限制。本试验旨在探究植物激素作为逆境缓解剂，在不同水质条件下对‘Sergipana’品种笋瓜种子萌发及幼苗初期生长的调控效应。试验采用完全随机设计，设置3×4因子组合，共4次重复。除空白对照组外，试验种子分别经赤霉素（gibberellic acid）与水杨酸（salicylic acid）处理，并分别使用自来水、养鱼场废水、自井水以及按1:1体积比混合的养鱼场废水与自井水进行灌溉。测定指标包括种子萌发率、初次萌发计数、萌发速率指数、幼苗地上部与根系长度、地上部与根系干重、可溶性糖、氨基酸及脯氨酸含量。结果表明，采用赤霉素与水杨酸处理‘Sergipana’品种笋瓜种子，可优化萌发动力学过程，并缓解笋瓜幼苗初期生长阶段水体盐度带来的负面影响。