Elucidating Drought Tolerance Potential of Maize (Zea mays L.) Inbred Lines through Polyethylene Glycol Induced Drought Stress
Nusrat ul Islam
Division of Genetics and Plant Breeding, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
M. A. Rather
Division of Genetics and Plant Breeding, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
P. A. Sofi
Division of Genetics and Plant Breeding, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
M. A. Wani
Division of Genetics and Plant Breeding, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
Gowhar Ali
AICRP, NSP, SKUAST-Kashmir, India.
Fehim, J. Wani
Division of Agri-Economics and Statistics, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
B. Kumar
Indian Institute of Maize Research (IIMR), New Delhi, India.
A. B. Shikari
Division of Genetics and Plant Breeding, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
Z. A. Dar
Dryland Agriculture Research Station, Rangreth Srinagar, India.
Shaheen Kauser
Division of Plant Pathology, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
Asif Ahmad Bhat
Division of Entomology, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
Shamshir Ul Hussan
Division of Genetics and Plant Breeding, FoA, Wadura, Sopore, SKUAST-Kashmir, India.
Tanveer Ahmad Ahngar *
Sher-e- Kashmir University of Agricultural Sciences and Technology of Kashmir, India.
*Author to whom correspondence should be addressed.
Abstract
Drought is one of the most distressing environmental stresses restraining the crop production . Drought undermines the plant growth from seedling to maturity and the studies have unveiled that the harmful impact of drought results in crops due to the damages perceived during crucial stages of development namely, germination, seedling development and flowering stages. Biometric elements and indices at an early growth stage could be employed in designing the selection criteria to figure out the drought tolerant genotypes. Breeding for drought-prone environments is constrained by lack of suitable selection indices of drought stress resistance. The present study was conducted to determine the reliability of in-vitro screening method for initiating drought breeding programme. Poly ethylene glycol (PEG) has been used often as abiotic stress inducer in many studies to screen drought tolerant germplasm. The present investigation was carried out to reveal the drought tolerance potential of 103 maize inbred lines by in-vitro screening under three levels of PEG levels viz., 0% as control, 10% and 20% and evaluating their effect on the root parameters like primary root length, number of seminals roots , number of lateral roots and root biomass. The seedlings exhibited a significant variation for all the traits analyzed. All the root parameters had highest value under control and had significant decline with increasing PEG concentrations (0% < 10% < 20%). The inbreds showing the best level of drought tolerance at all levels of PEG induced stress can be used as a source of drought tolerance for the improvement of drought tolerant hybrids . The variation among maize inbreds for these traits was found to be an ideal indicator to screen the drought tolerant genotypes at early growth stages.
Keywords: Drought, drought tolerance, PEG (polyethylene glycol), primary root length, lateral roots, root biomass