|Table of Contents|

EVALUATION，ECO-REGION CHARACTERIZATION AND ELITE GERMPALSM IDENTIFICATION OF SUBMERGENCE TOLERANCE AT SEEDLING STAGE IN WILD AND CULTIVATED SOYBEANS(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2007年06期
Page:
828-834
Research Field:
Publishing date:

Info

Title:
EVALUATION，ECO-REGION CHARACTERIZATION AND ELITE GERMPALSM IDENTIFICATION OF SUBMERGENCE TOLERANCE AT SEEDLING STAGE IN WILD AND CULTIVATED SOYBEANS
Author(s):
WANG Fang; ZHAO Tuan-jie; GAI Jun-yi
Soybean Research Institute/Nanjing Agricultural University/National Center for Soybean Improvement/National Key Laboratory for Crop Genetics and Germplasm Enhancement，Nanjing 210095
Keywords:
Soybean; Germplasm resource; Submergence tolerance; Eco-region
PACS:
S565.1
DOI:
10.3969/j.issn.1000-9841.2007.06.005
Abstract:
Identification of germplasm with flooding tolerance is a basic work in breeding for tolerance in soybean. There are two facets in flooding tolerance，i.e. tolerance to soil waterlogging and tolerance to submergence. The objective of the present research was to establish an evaluation system for submergence tolerance of soybeans at seedling stage and then use it to evaluate the germplasm accessions from different eco-regions and screen for elite accessions highly tolerant to submergence at seedling stage for breeding programs. The cultivated soybean (Glycine max(L.)Merr.)and annual wild soybean (Glycine soja Sieb & Zucc.)accessions from different eco-regions were sampled and used in this experiment. The submergence experiment of soybean was carried out at seedling stage with artificial flooding in pot experiment under randomized complete blocks design. The relative death percentage was used as tolerance index.There were significantly genetic differences both among the genotypes of wild and cultivated soybean. The frequency of highly tolerant wild soybean was slightly more than that of cultivated soybean，but most part of both cultivated and wild soybean was intermediate and less sensitive to submergence. There existed certain amount of variation of submergence tolerance both within and among eco-regions in G. soja，while in G. max the among eco-region variation was smaller than the within eco-region variation，of which the CV values were all more than 30.0%. There showed a weak correlation between submergence tolerance and some traits，including geographical latitude，seed coat color，100-seed weight，maturity date，and fat content. Eleven elite accessions with high tolerance to submergence，including eight G. sojaaccessions and three G. max accessions，such as N24835.0，N24850.0，N23444.0，N04974.1 were identified and selected，which will be important sources for future submergence tolerance breeding programs.

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