Pakistan Journal of Botany · 2009 · 205 citations · 12 references
AgriculturePlant BiologyPlant SciencesBreeding For Abiotic Stress ToleranceCrop PhysiologyPlant EcophysiologyDrought PhysiologyDrought Stress PhysiologyDrought ToleranceDrought Tolerance BreedingPhenotyping For Abiotic Stress ToleranceSeedling Stage Stress ToleranceDrought Effects On GerminationDrought Stress EffectsDrought Tolerance IndexSeedling Establishment Under DroughtSeedling Stage Drought ToleranceSeedling Stress ToleranceStress Tolerance IndicesWater Stress Tolerance
Response of six sunflower hybrids/ breeding lines viz., G-101, SF-187, Hysun-33, Hysun-38, 64A-93 and S-278 to drought stress imposed at germination and seedling growth stages was investigated in a laboratory experiment (25±3C). Five water stress levels of zero (control), -0.35, -0.6, -1.33, and 1.62 MPa were developed using polyethyleneglycol-6000 (PEG-6000). Complete randomized design with three replications was used for this experiment. Germination stress tolerance index (GSI), plant height stress index (PHSI), root length stress index (RLSI) and dry matter stress index (DMSI) were used to evaluate the genotypic response to PEG-induced water stress. Plant height and dry matter stress tolerance indices for all sunflower hybrids decreased with increasing water stress. In contrast, an increase in RLSI was observed in all sunflower hybrids. Sunflower hybrids G-101 and 64-A-93 performed better and were classified as drought tolerant. The variation among hybrids for DMSI was found to be a reliable indicator of drought tolerance in sunflower.
12
Maria Cristina de Figueiredo e Albuquerque, N. M. Carvalho · Seed Science and Technology · 2003 · 87 citations · Full text