Response of New Genotypes of Rapeseed (Brassica napus) to Late Season Withholding Irrigation under Semi-Arid Climate

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EYNI NARGESEH HAMED; AGHAALIKHANI MAJID; SHIRANI RAD AMIR HOSEIN; MOKHTASI BIDGOLI ALI; MODARES SANAVI SEYED ALI MOHAMMAD

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Journal: Plant Productions Year:2019 | Volume:41 | Issue:4 Page(s): 55-68

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Title

Response of New Genotypes of Rapeseed (Brassica napus) to Late Season Withholding Irrigation under Semi-Arid Climate

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Keywords

Grain yieldQ2

Oil yieldQ1

Silique settingQ2

Water deficit stressQ2

Abstract

Background and Objectives: Water deficit stress is one of the most important environmental stresses which affect the crop production. Genetic improvement or application of drought tolerant genotypes is recommended to increase crop production under water restricted conditions. The objective of the current study is investigating the withholding irrigation effect in terminal stages of the growing season on agronomic performance of rapeseed new genotypes in a semi-arid climate. Materials and Methods: The experiment was conducted during 2015-2016 growing season in Karaj, Iran. Experimental factors (two water irrigation regimes and 17 rapeseed genotypes) were investigated with factorial arrangement of treatments based on a randomized complete block design (RCBD) with three replications. In this study, several different traits including plant height, number of silique per plant, number of grain per silique, 1000-grain weight, Grain yield, biomass, oil percentage and Oil yield were measured. To determine the most tolerant genotypes, stress tolerance indices (SSI, TOL, STI and GMP) were calculated under stress (withholding irrigation from Silique setting stage until the end of the growing season) and non-stress (normal irrigation) conditions. Also, agronomic water use efficiency (WUEagr) was calculated for both irrigation conditions. Results: Mean comparison of the interaction between withholding irrigation and genotypes showed that the responses of genotypes were different in terms of plant height, number of silique per plant, number of grain per silique, 1000-grain weight, Grain yield, biomass, and Oil yield at irrigation different treatments. Finally under withholding irrigation treatment from Silique setting stage until the end of the growing season, Lauren hybrid was identified as the superior genotype due to suitable agronomic traits such as plant height (158. 9 cm), number of silique per plant (158. 6), number of grain per silique (18. 6), 1000-grain weight (3. 44 g), biomass (15471 kg. ha ), Grain yield (3854. 3 kg. ha-1 ), oil percentage (43. 33%) and Oil yield (1668. 3 kg. ha-1). Based on the stress tolerance indices among 17 rapeseed genotypes, the most tolerant genotypes were Lauren, Zorica, Alonso and Zlanta. Finally with considering to WUEagr (Kg. ha1-1. mm ), Zorica (0. 92), Artist and Lauren genotypes (0. 88) had the highest WUEagr under normal irrigation conditions, while Alonso (0. 86), Lauren (0. 84) and KL3721 (0. 82) had the highest WUEagr under withholding irrigation conditions. Discussion: Generally in this study, the amount of the studied traits was decreased under conditions of withholding irrigation compared to the full irrigation. Yield components such as silique number per plant, grain number per silique and 1000-grain weight could be considered as key traits affecting rapeseed Grain yield under withholding irrigation.

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APA: Copy

EYNI NARGESEH, HAMED, AGHAALIKHANI, MAJID, SHIRANI RAD, AMIR HOSEIN, MOKHTASI BIDGOLI, ALI, & MODARES SANAVI, SEYED ALI MOHAMMAD. (2019). Response of New Genotypes of Rapeseed (Brassica napus) to Late Season Withholding Irrigation under Semi-Arid Climate. THE PLANT PRODUCTION (SCIENTIFIC JOURNAL OF AGRICULTURE), 41(4 ), 55-68. SID. https://sid.ir/paper/399081/en

Vancouver: Copy

EYNI NARGESEH HAMED, AGHAALIKHANI MAJID, SHIRANI RAD AMIR HOSEIN, MOKHTASI BIDGOLI ALI, MODARES SANAVI SEYED ALI MOHAMMAD. Response of New Genotypes of Rapeseed (Brassica napus) to Late Season Withholding Irrigation under Semi-Arid Climate. THE PLANT PRODUCTION (SCIENTIFIC JOURNAL OF AGRICULTURE)[Internet]. 2019;41(4 ):55-68. Available from: https://sid.ir/paper/399081/en

IEEE: Copy

HAMED EYNI NARGESEH, MAJID AGHAALIKHANI, AMIR HOSEIN SHIRANI RAD, ALI MOKHTASI BIDGOLI, and SEYED ALI MOHAMMAD MODARES SANAVI, “Response of New Genotypes of Rapeseed (Brassica napus) to Late Season Withholding Irrigation under Semi-Arid Climate,” THE PLANT PRODUCTION (SCIENTIFIC JOURNAL OF AGRICULTURE), vol. 41, no. 4 , pp. 55–68, 2019, [Online]. Available: https://sid.ir/paper/399081/en

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