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Genetic Variation in Salt Tolerance during Seed Germination in a Backcross Inbred Line Population and Advanced Breeding Lines Derived from Upland Cotton × Pima Cotton
Author(s) -
Tiwari Rashmi Sharma,
Picchioni Geno A.,
Steiner Robert L.,
Hughs Sidney E.,
Jones Don C.,
Zhang Jinfa
Publication year - 2013
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2013.01.0028
Subject(s) - germination , biology , backcrossing , gossypium barbadense , agronomy , inbred strain , heritability , population , fiber crop , germplasm , gossypium , hybrid , plant breeding , genetic variation , malvaceae , horticulture , gossypium hirsutum , gene , genetics , demography , sociology
Seed germination is a crucial phase of the plant life cycle that affects its establishment and productivity. However, information on salt tolerance at this phase is limited. Pima cotton ( Gossypium barbadense L.) may be more salt tolerant during germination than Upland cotton ( Gossypium hirsutum L.) based on its evolutionary and breeding history. The objective of this study was to evaluate germination salt tolerance of introgressed lines derived from hybrids between the two species under standard controlled conditions. A backcross inbred line (BIL) population of 146 lines from a cross between Upland cotton ‘Sure‐Grow’ (SG) 747 and ‘Pima S‐7’ (Test 1) and 120 advanced breeding lines from ‘Acala 1517‐99’ × Pima Phy 76 (Test 2) were evaluated for germination under 200 mM NaCl and nonsalt (control) conditions. Based on reduction in seed germination under NaCl conditions, G. barbadense parents were significantly more tolerant than the Upland parents. There were significant effects of genotype, treatment, and genotype × treatment interaction in both tests. The heritability for seed germination was moderate, ranging from 0.39 to 0.43 with at least two genes estimated. The genetic result is corroborated by the identification of many salt tolerant BILs and advanced breeding lines. This study has provided one of the first lines of evidence that the introduction of salt tolerance at seed germination from Pima into Upland cotton may be attainable.