摘要
为探究砧用南瓜苗期根系形态指标、总糖含量与其耐高渗胁迫的相关性,以及高渗胁迫下髓腔发育情况,以16个砧用南瓜品种为试材,采用根系扫描法测定播种后14 d幼苗根系表型参数并提取根系构型,测定根系总糖含量,利用主成分分析、单因素方差分析等筛选根系性状差异较大品种并测定其高渗胁迫下茎叶及根系生长指标、总糖含量和髓腔发育情况,综合评价砧用南瓜幼苗对高渗胁迫的耐受性。结果表明:16个品种幼苗根系表型参数经PCA降维后显示黑籽南瓜和嘉藤青木具有较大差异,黑籽南瓜的总根长、根表面积和根系分叉数等9个根系表型指标及根系总糖含量均显著高于嘉藤青木;经高渗胁迫处理后,黑籽南瓜茎叶及根系生长指标显著优于嘉藤青木,且根系总糖含量在持续高渗胁迫处理15 d后仍能保持相对稳定,下胚轴髓腔发育也对高渗胁迫较不敏感。根系主要形态指标和总糖含量可作为筛选耐高渗胁迫砧木的重要参考指标;黑籽南瓜综合评价最高,对高渗胁迫表现出较强的耐受性,是能适应一定高渗胁迫环境的优良砧木。
In order to investigate the correlation between root morphology index of pumpkin seedling used as rootstock,total sugar content and its tolerance to hypertonic stress,and also the development situation of pith cavity under hypertonic stress,this study took 16 pumpkin varieties used as rootstock as test material;measured the root system phenotype parameters of the seedlings 14 d after sowing by root scanning method;and extracted root configuration;determined content of total sugar in root system;screened varieties with greater differences in root characters through principal component analysis(PCA)and one-way ANOVA,etc.;and also measured the growth indexes of stems,leaves and root system,contents of total sugar and development situation of pith cavity under hypertonic stress.Then,the tolerance of pumpkin seedlings used as rootstock to hypertonic stress were evaluated comprehensively.The results showed that the seedling root system phenotypic parameters of 16 varieties after dimension reduction showed greater differences between Blackseed Pumpkin and Kato Aoki.Nine root phenotypic indexes including total root length,root surface area and root branching numbers,etc.and root total sugar content of Blackseed Pumpkin were significantly higher than those of Kato Aoki.After hypertonic stress treatment,the stem,leaf and root growth indexes of Blackseed Pumpkin were significantly superior to those of Kato Aoki.Furthermore,the root system total sugar content of Blackseed Pumpkin still remained relatively stable even after 15 d persistent hypertonic stress treatment.Besides,the hypocotyl pith cavity development was less sensitive to hypertonic stress.In conclusion,the main morphological parameters and total sugar content in root system can be used as important reference indexes for screening rootstock resistant to hypertonic stress.The Blackseed Pumpkin has the highest overall ranking and shown a stronger tolerance to hypertonic stress.It is an excellent rootstock adaptable to certain hypertonic stress environment.
作者
张棣莛
张梦夏
尚庆茂
ZHANG Diting;ZHANG Mengxia;SHANG Qingmao(National Nanfan Institute,Chinese Academy of Agriculture Sciences,Sanya 572024,Hainan,China;State Key Laboratory of Vegetable Bio-breeding,Institute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences,Beijing 100081,China)
出处
《中国蔬菜》
北大核心
2024年第6期65-73,共9页
China Vegetables
基金
三亚市农业农村局“院地联合”攻关项目(YDLH05)
海南省重大科技计划项目(ZDKJ2021005)
中央引导地方区域创新体系建设项目(XZ202202YD0002C-10)
中央级公益性科研院所基本科研业务费专项资助(IVF-BRF2022011)
财政部和农业农村部:国家现代农业产业技术体系资助项目(CARS-23-B10)。
关键词
南瓜砧木
高渗胁迫
根系
总糖含量
髓腔
pumpkin rootstock
hypertonic stress
root system
contents of total sugar
pith cavity
