Effect of Drought on Morpho-Physiological Traits of Sunflower (Helianthus Annuus L) Hybrids and their Parental Inbred Lines
Effect of Drought on Morpho-Physiological Traits of Sunflower (Helianthus Annuus L) Hybrids and their Parental Inbred Lines
Rizwana Qamar1, Maria Ghias1, Fida Hussain1, Sajida Habib1, Muhammad Khuram Razzaq2*, Muhammad Aslam1 and Imran Habib3
ABSTRACT
Water stress is the most significant restrictive factor for agricultural production in Pakistan. Sunflower productivity is sturdily delimited by the inaccessibility of water. Developments of sunflower hybrids having greater drought tolerance are the effective and inexpensive approach by plant breeders to manage with drought. A wire house experiment was conducted in Oilseeds Research Institute, Ayub Agricultural Research Faisalabad for the screening of genotypes against drought. Ten hybrids along with their 13 parental inbred lines were grown in polythene bags following factorial structured completely randomized design by three replications against three levels of water stress. Data was recorded on root length (cm), shoot length (cm), plant fresh weight (g), plant dry weight (g), chlorophyll fluorescence, leaf temperature (°C) and relative water contents (%). Results indicated the presence of significant genetic variability among hybrids and inbred lines. Hybrids had more tolerance to drought conditions on both levels of water stress treatments. With the increase in stress, root length and leaf temperature increased, while shoot length, plant fresh and dry weight, chlorophyll fluorescence and relative water content decreased at seedling stage. Hybrid FH-630 and Hysun-33 are identified as the most drought tolerant genotypes used in present study.
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