Identification of QTL for Early Vigor and Stay-Green Conferring Tolerance to Drought in Two Connected Advanced Backcross Populations in Tropical Maize (Zea mays L.)

Autor: Raman Babu, Gary Atlin, Hongjian Zheng, Dapeng Sun, Edgar Antonio Suarez, Xuecai Zhang, Felix M. SanVicente, Samuel Trachsel
Jazyk: angličtina
Rok vydání: 2016
Předmět:
0106 biological sciences
0301 basic medicine
Aging
Heterosis
Physiology
Plant Science
Flowering time
Plant Genetics
01 natural sciences
Plant Resistance to Abiotic Stress
Medicine and Health Sciences
Flowering Plants
Multidisciplinary
Ecology
Agriculture
Plants
Zea mays
Horticulture
Phenotypes
Plant Physiology
Medicine
Research Article
Drought Adaptation
Science
Drought tolerance
Quantitative Trait Loci
Crops
Quantitative trait locus
Biology
Senescence
Research and Analysis Methods
03 medical and health sciences
Model Organisms
Anthesis
Plant and Algal Models
Plant-Environment Interactions
Botany
Genetics
Plant Defenses
Grasses
Allele
Plant Ecology
Ecology and Environmental Sciences
Organisms
Biology and Life Sciences
Plant Pathology
Maize
030104 developmental biology
Genetic Loci
Backcrossing
Physiological Processes
Organism Development
010606 plant biology & botany
Developmental Biology
Crop Science
Cereal Crops
Zdroj: PLoS ONE, Vol 11, Iss 3, p e0149636 (2016)
PLoS ONE
ISSN: 1932-6203
Popis: We aimed to identify quantitative trait loci (QTL) for secondary traits related to grain yield (GY) in two BC1F2:3 backcross populations (LPSpop and DTPpop) under well-watered (4 environments; WW) and drought stressed (6; DS) conditions to facilitate breeding efforts towards drought tolerant maize. GY reached 5.6 and 5.8 t/ha under WW in the LPSpop and the DTPpop, respectively. Under DS, grain yield was reduced by 65% (LPSpop) to 59% (DTPpop) relative to WW. GY was strongly associated with the normalized vegetative index (NDVI; r ranging from 0.61 to 0.96) across environmental conditions and with an early flowering under drought stressed conditions (r ranging from -0.18 to -0.25) indicative of the importance of early vigor and drought escape for GY. Out of the 105 detected QTL, 53 were overdominant indicative of strong heterosis. For 14 out of 18 detected vigor QTL, as well as for eight flowering time QTL the trait increasing allele was derived from CML491. Collocations of early vigor QTL with QTL for stay green (bin 2.02, WW, LPSpop; 2.07, DS, DTPpop), the number of ears per plant (bins 2.02, 2.05, WW, LPSpop; 5.02, DS, LPSpop) and GY (bin 2.07, WW, DTPpop; 5.04, WW, LPSpop), reinforce the importance of the observed correlations. LOD scores for early vigor QTL in these bins ranged from 2.2 to 11.25 explaining 4.6 (additivity: +0.28) to 19.9% (additivity: +0.49) of the observed phenotypic variance. A strong flowering QTL was detected in bin 2.06 across populations and environmental conditions explaining 26-31.3% of the observed phenotypic variation (LOD: 13-17; additivity: 0.1-0.6d). Improving drought tolerance while at the same time maintaining yield potential could be achieved by combining alleles conferring early vigor from the recurrent parent with alleles advancing flowering from the donor. Additionally bin 8.06 (DTPpop) harbored a QTL for GY under WW (additivity: 0.27 t/ha) and DS (additivity: 0.58 t/ha). R2 ranged from 0 (DTPpop, WW) to 26.54% (LPSpop, DS) for NDVI, 18.6 (LPSpop, WW) to 42.45% (LPSpop, DS) for anthesis and from 0 (DTPpop, DS) to 24.83% (LPSpop, WW) for GY. Lines out-yielding the best check by 32.5% (DTPpop, WW) to 60% (DTPpop, DS) for all population-by-irrigation treatment combination (except LPSpop, WW) identified are immediately available for the use by breeders.
Databáze: OpenAIRE
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