PJB-2019-913
UNCOVERING THE GENETIC POTENTIAL OF RAPESEED (BRASSICA NAPUS L.) GENOTYPES AGAINST WATER DEFICIT CONDITION
1. Sajid Hussain Rao
Abstract
Water stress is a major abiotic factor, which limits production of major crops in many areas of Pakistan and so as at the world level. Inspite of all the efforts made over the past few decades, the productivity of rapeseed crop has still been remained almost stagnant; though there is abundant genetic variability is found in rapeseed (Brassica napus L.) genotypes for seed yield and other economic characters. In this context, a group of 20 rapeseed genotypes was assessed against water stresses under natural field conditions at three treatments including control under randomized complete block design in factorial arrangement with four replications. The treatments were (i) control (4 irrigations; at four main stages i.e. stem growth, flowering, siliqaue formation and maturity) (ii) water stress at maturity (3 irrigations; at three main stages i.e. stem growth, flowering and siliqaue formation) and (iii) water stress at siliqaue formation (2 irrigations; at two main stages i.e. stem growth and flowering). The mean squares showed that genotypes, treatments and genotype x treatment interactions was significantly differences for chlorophyll (SPAD), relative water content, seed yield, seed index, oil content and protein content, signifying that breeding materials used in the present research has worth to be used in future rapeseed genotype programs. Based on less reduction in above mentioned characters due to water stress conditions, a group of six rapeseed genotypes like Rainbow, Rohi Sarson, Hyola-401, Punjab Sarson, CON-I, and NARC Sarson were recognized tolerant ones against water stress conditions; hence these rapeseed genetic materials may be utilized for further genetic analysis under water stress conditions. This indicates that these rapeseed genotypes may provide useful genetic recombinations for water stress conditions hence may be exploited for further breeding programs.
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