این آزمایش برای بررسی کارایی دما و زمان‌های مختلف اعمال تیمار آب داغ در مراحل مختلف رشد زایشی بر اخته کردن فیزیکی کاهو در تولید بذور هیبرید انجام شد. برای اعمال تیمار، شاخه‌های جانبی از گل‌آذین را به مدت 20، 35، 50 و 65 ثانیه، یک بار در مرحله شکوفایی جوانه و یک بار در مرحله جوانه گل (دو روز قبل از شکوفایی) در آب با دو سطح دمایی 40 و 50 درجه سانتی‌گراد (آب داغ) و 25 درجه سانتی‌گراد به عنوان شاهد فرو برده شد. نتایج تجزیه واریانس نشان داد دماهای مختلف آب تأثیر معنی‌داری بر درصد بذور هیبرید تشکیل شده داشت در حالیکه مرحله کاربرد آب داغ و اثرات متقابل آنها تأثیری بر درصد بذور هیبرید نداشت. بیشترین درصد بذور هیبرید (57/94 درصد) و گرده‌های نابارور (07/84 درصد) با کاربرد آب داغ 50 درجه سانتی‌گراد بدست آمد. استفاده از اخته کردن با آب داغ یک روش ساده و بدون نیاز به هزینه کارگری زیاد است و برای اصلاح کاهو قابل توصیه می‌باشد.
Evaluation of Different Hot Water Levels at Lettuce (Lactuca sativa L.) Emasculation for Hybrid Seed Production
نویسندگان [English]
P. Khatib1؛ JA. Olfati2؛ Y. Hamidoghli2
چکیده [English]
An experiment was conducted to evaluate efficiency of different time and duration of hot water for lettuce physical emasculation. In this research, immerse side branches of the inflorescence in the blooming and bud stages , put in hot water (40 and 50° C) where water at temperatures 25° C was used as control, for 20, 35, 50 and 65 seconds. Analysis of variance revealed that different water temperatures had significant affects on the percentage of hybrid seeds in the blooming and bud stage (two days before flowering), whereas the hot water emasculation and their interaction had no significant affects. The highest percentage of hybrid seeds (94.57%) and non-fertile pollens (84.07%) were obtained by the using of water at temperature 50° C .
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