河北农业科学2026，Vol.30Issue(2)：26-32,7.DOI:10.12148/hbnykx.20260064
番茄和小白菜幼苗生长及根系发育对多生菌脂(PHA)施用的响应特征
Growth and Root Developmental Responses of Tomato and Pakchoi Seedlings to Polyhydroxyalkanoate(PHA)Application
摘要
Abstract
This study investigated the regulatory effects of polyhydroxyalkanoate(PHA)on vegetable seedling growth,with a view to clarifying its optimal application dosage for growth promotion and providing a scientific basis for the standardized and rational application of PHA in vegetable seedling production.A greenhouse pot experiment was conducted using tomato and pakchoi seedlings as test materials.Treatments were set as follows:a blank control with no PHA application(CK0),two reference controls of commercial homologous products(mineral-source potassium fulvate,JP1;enzymatic humic acid,JP2),and five PHA treatments with gradient dosages(0.5,1.0,2.0,4.0,8.0 mL/kg soil).The effects of PHA at different dosages on above-ground growth and root development of veg-etable seedlings were examined.The results showed that,in terms of above-ground growth indices,PHA treatments at appropriate dosages significantly in-creased seedling plant height,stem diameter,leaf SPAD value and biomass accumulation compared with CK0.All indices generally presented a trend of first increasing and then decreasing with rising PHA dosage.For tomato seedlings,the optimal growth-promoting effect was achieved within the dosage range of 0.5-1.0 mL/kg,and 0.5 mL/kg was identified as the economic application dosage.For pakchoi seedlings,the growth-promoting effect was optimal and stable at the dosage of 0.5 mL/kg.In terms of root development indices,PHA at appro-priate dosages significantly elevated root morphological indices including total root length,total root surface area and number of root tips,and facilitated root establishment.However,when the PHA dosage reached≥4.0 mL/kg,it exerted a distinct inhibitory effect on root growth,with root-related indices lower than those of the blank control.According to the comprehensive evaluation of the overall performance of both tomato and pak-choi,the general optimal dosage of PHA for promoting above-ground growth and root development of vegetable seedlings was 0.5 mL/kg air-dried soil.The growth-promoting effect at this dosage was comparable to that of mineral-source potassium fulvate,suggesting that PHA can serve as a novel biostimulant for vegetable seedling management.关键词
多生菌脂(PHA)/蔬菜苗期/地上部生长/根系发育/适宜用量Key words
Polyhydroxyalkanoate/Vegetable seedling/Growth/Root development/Optimal dosage分类
农业科技引用本文复制引用
史建硕,蒋龙刚,秦彦林,李义红,贾舟,郭丽,侯升林,王丽英..番茄和小白菜幼苗生长及根系发育对多生菌脂(PHA)施用的响应特征[J].河北农业科学,2026,30(2):26-32,7.基金项目
河北省科技研发平台专项(24466901D) （24466901D）
石家庄市重点研发计划项目(231490142A) （231490142A）
河北省农林科学院现代农业科技创新专项(2022KJCXZX-ZHS-1) （2022KJCXZX-ZHS-1）
