Evaluation the reaction of safflower (Carthamus tinctorius L.) cultivars to irrigation cutting stress at different growth stages

Subject Areas : Journal of Plant Ecophysiology

A.  Fallah ¹ (گروه زراعت و اصلاح نباتات، دانشگاه پیام نور واحد کرج، کرج، ایران)
F.  Nouri ² (گروه زراعت و اصلاح نباتات، دانشگاه پیام نور واحد کرج، کرج، ایران)
C.  Mansourifar ³ (گروه زراعت و اصلاح نباتات، دانشگاه پیام نور واحد کرج، کرج، ایران)

Received: 2015-09-24 Accepted : 2015-09-24 Published : 2015-09-01

Keywords: Grain yield, irrigation cutting, oilseed, Yield components,

Abstract :

Safflower (Carthamus tinctorius L.) cultivars had different tolerance to drought stress at different growth stages. Current study was conducted to evaluate and determine differences in drought tolerance at different stages of growth of Iranian safflower cultivars during 2013-2014 growing season as a factorial experiment based on randomized complete block design. The effect of drought stress as irrigation cut in different stages  included blooming, flowering, seed filling, blooming + seed filling and blooming + flowering with control was examined on growth and yield of four Iranian safflower cultivars (Uremia3147, Zarghan279, Azarbaijan3148 and Varamin295). The results showed that irrigation cut, depending to growth stage, reduced day to flowering and maturity, plant height, grain number per head, biological yield and grain yield. Azarbaijan 3418 cultivar had higher grain yield and Varamin 295 cultivar had higher drought tolerance. The highest negative impact of stress on yield related to irrigation cut was observed at blooming + flowering (24.6%), blooming + seed setting (23.1%) stages and the lowest one was obtained at seed setting stage (19.7%). Generally, Varamin 279 with irrigation cut at seed setting stage could be recommended for more investigation under limited moisture conditions. � مرحله دانه‌بندی (7/19%) بود. به طورکلی، کاشت رقم ورامین 279 و قطع آبیاری در مرحله دانه‌بندی برای استفاده در شرایط محدودیت رطوبت قابلیت بررسی بیشتری دارد.