Effects of Water Deficit Stress on Several Quantitative and Qualitative Characteristics of Canola (Brassica napus L.) Cultivars

Abstract

Water deficit stress considered as one of the most important limiting factors for oil seed canola (Brassica napus L.) growth and productivity in Iran. To evaluate the effects of water deficit stress on some qualitative and quantitative characteristics of canola cultivars, this experiment in a greenhouse trial carried out as factorial based on completely randomized design with three replications in Shahid Chamran University of Ahwaz (Iran). Canola cultivars, including 'Hyola 308' , 'Hyola 401' and 'RGS 003' as first factor, and the second one was three levels of water deficit stress, including stress at early stem elongation stage to early flowering (D 1 ), early flowering stage to early emergence of sacs (D 2 ), beginning of stem elongation stage to early emergence of sacs (D 3 ) and normal irrigation (C, as check). Results showed that the interaction between water deficit stress and cultivars affected biological yield, seed oil yields and harvest index (p≤0.01), dry matter and economic yield (p≤0.05). Water deficit stress reduced grain oil yields. 'Hyola 308' under stress at beginning stem elongation stage to early flowering had the lowest oil yields (1.1 g plants ). The decrease of oil yields at the flowering stage to stem elongation stage was more than the other stages. In addition, water deficit stress reduced harvest index in the three stress levels due to reduced economic yield and reduced biological yield. Stress susceptibility index for 'Hyola 401' at the beginning of stem elongation stage to early emergence of sacs was 0.914 and the 'Hyola 308' showed 1.12 at the beginning of stem elongation stage to early emergence of sacs respectively, which it can implies that 'Hyola 308' is more sensitive than 'Hyola 401' to water deficit stress.

Effects and management strategies to mitigate drought stress in oilseed rape (Brassica napus L.): a review

“…Under water deficit stress reduction in shoot growth was due to imbalance in water relations which leads to less cell expansion and enlargement and ultimately stunted rape plant growth (Gul, Ahmad, 2004). Stem elongation to flowering stage of rape is most sensitive to water deficit stress (Hosseini, Hassibi, 2011). Higher stem height of rape was recorded in control treatment and stem height decreased with decrease in irrigation level (Hadi et al, 2014).…”

Effect of Varying Amounts of Biological Phosphorus on the Morphological Characteristics, Yield and Yield Components of Brassica napus L. under End Season Water Deficit

“…Chimenti et al (2002) and Erdem et al (2006) indicated that grain yield and weight of 1000 grains decreased with increasing drought stress. Hosseini and Hassibi (2011) showed that water deficit stress in the beginning stage of stem elongation to early flowering showed lowest susceptibility to stress. There was a sharp increase in seed yield by irrigation disruption at the end of flowering and after this stage, especially with 50 g/ ha biological phosphorus.…”

“…Oilseed canola plant (Brassica napus L.) is an important agricultural crop grown primarily for its edible oil and the meal that remains after oil extraction has value as a source of protein for the livestock feed industry ( Jensen et al, 1996). Canola container valuable fatty acids and amino acid required by the human body, with 40-49 percent and 35-39 percent protein and oil respectively (Hosseini and Hassibi, 2011).…”

Effect of Water Deficiency and Potassium Application on Plant Growth, Osmolytes and Grain Yield of Brassica Napus Cultivars

“…The different physiological traits like photosynthesis, velocity and rate of assimilate transfer from source to sink determine seed yield (CHHABRA et al 2007, ALBARRAK 2006. Furthermore, at any stage of crop growth such as germination, moisture stress can cause an irreversible loss in yield potential (REGINATO 1983, HOSSEINI and HASSIBI 2011, KHALIL et al 2012). Genotypic differences in effi ciency of K uptake and utilization have been reported for all major economically important plants (RENGEL and DAMON 2008).…”