Effects of nitrogen application rate on starch accumulation and starch synthetase activity in Sagittaria sagittifolia
LIN Zhicheng
JIANG Wen
GAO Meiping
TAO Yunrong
YANG Qunfang
LIANG Lingling
Abstract：In order to study the effects of different nitrogen application rates on starch accumulation and the activity of key enzymes of starch synthesis during the development of Sagittaria sagittifolia,four different nitrogen application rates were set up with the main variety of S.sagittifolia Guici No.1 in Guangxi as experimental material.With the increase of nitrogen application rate,the content of amylose,amylopectin and total starch in corms increased at first and then de-creased,and N2 treatment(240 kg·hm-2)had the best effect.The peak time of enzyme activity and starch accumulation rate was not affect by different nitrogen application rates,which occurred in the middle stage of corm expansion(90 days after planting),and the amylopectin and total starch accumulation rate of N2 treatment had the maximum after planting 75 and 90 days.Further correlation analysis showed that the starch accumulation rate was significantly positively correlat-ed with GBSS,SSS,AGPP,and SBE activity.In general,the starch content of Guici No.1 is the highest under N2 treat-ment(240 kg·hm-2),and the reasonable application of nitrogen fertilizer is conducive to the accumulation of starch in SS.sagittifolia and improvement of quality.
Keywords：Sagittaria sagittifoliaNitrogen application rateStarch accumulationStarch synthase
Publication Date：2025-06-05
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 152-157 )