کمی سازی تاثیر زوال بذر بر دمای کاردینال بذور شکرتیغال (echinops ritro) با استفاده از مدل‌های غیرخطی

این مطالعه به‌منظور تعیین دمای کاردینال بذرهای زوال یافته شکرتیغال این مطالعه به‌صورت فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار در دانشگاه کشاورزی و منابع طبیعی خوزستان اجرا شد. عامل اول پیری در 5 سطح 0، 24، 48، 72 و 96 ساعت زوال و دماهای جوانه‌زنی در 7 سطح 5، 10، 15، 20، 25، 30، 35 و 40 درجه سانتی‌گراد بود. نتایج نشان داد که درصد و سرعت ﺟﻮاﻧﻪزﻧﯽ ﺗﺤﺖ ﺗﺄﺛﯿﺮ اﺛﺮ ﻣﺘﻘﺎﺑﻞ دﻣﺎ در زوال ﻗﺮا ﮔﺮﻓﺘﻨﺪ. ﺑﺎﻻﺗﺮﯾﻦ درﺻﺪ ﺟﻮاﻧﻪزﻧﯽ 98 % در دﻣﺎی 20 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد در ﺑﺬور زوال ﻧﯿﺎﻓﺘﻪ و دﻣﺎﻫﺎی 15 ﺗﺎ 20 در زوال 24 و 48 ﺳﺎﻋﺖ ﻣﺸﺎﻫﺪه ﺷﺪ. ﺑﺎﻻﺗﺮﯾﻦ ﺳﺮﻋﺖ ﺟﻮاﻧﻪزﻧﯽ 496 / 0 ﺗﻌﺪاد در روز ﻧﯿﺰ در ﺑﺬور زوال ﻧﯿﺎﻓﺘﻪ در دﻣﺎی 20 و 25 درﺟﻪ ﻣﺸﺎﻫﺪه ﺷﺪ. ﺑﺮآورد ﻣﺪلﻫﺎی ﻏﯿﺮﺧﻄﯽ ﺑﺮ ﺳﺮﻋﺖ ﺟﻮاﻧﻪزﻧﯽ ﻧﯿﺰ ﻧﺸﺎن داد، در ﺑﯿﻦ ﻣﺪلﻫﺎی ﻣﻮرد ارزﯾﺎﺑﯽ ﻣﺪل دﻧﺪاﻧﻪای ﺑﻬﺘﺮﯾﻦ ﻣﺪل r^2= 0.850 until 0.990, rmse= 0.040 until 0.12, aicc=-4.66 until -11.90 ﺑﺮای ﺗﻌﯿﯿﻦ دﻣﺎﻫﺎی ﮐﺎردﯾﻨﺎل ﺟﻮاﻧﻪزﻧﯽ ﺑﺬرﻫﺎی ﺷﮑﺮﺗﯿﻐﺎل در ﺳﻄﻮح ﻣﺨﺘﻠﻒ زوال ﺑﻮد. دﻣﺎی ﭘﺎﯾﻪ ﺟﻮاﻧﻪزﻧﯽ ﺷﮑﺮﺗﯿﻐﺎل در ﺷﺮاﯾﻂ ﺑﺪون زوال 97/ 0 0 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد ﺗﺨﻤﯿﻦ زده ﺷﺪ ﮐﻪ در 24 ﺳﺎﻋﺖ زوال ﺑﻪ 9/ 1 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد اﻓﺰاﯾﺶ و در زوالﻫﺎی ﺑﺎﻻﺗﺮ 96 ﺳﺎﻋﺖ ﻧﯿﺰ ﻣﺠﺪد ﺑﻪ 0/68 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد ﮐﺎﻫﺶ ﯾﺎﻓﺖ. دﻣﺎی ﺑﻬﯿﻨﻪ ﺟﻮاﻧﻪزﻧﯽ اﯾﻦ ﮔﯿﺎه ﻧﯿﺰ ﺑﯿﻦ 20 ﺗﺎ 30 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد در ﺷﺮاﯾﻂ ﺑﺪون زوال ﺑﻮد ﮐﻪ در اﺛﺮ زوال ﻣﻼﯾﻢ 24 و 48 ﺳﺎﻋﺖ ﺑﻪ 19 ﺗﺎ 31 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد اﻓﺰاﯾﺶ ﯾﺎﻓﺖ وﻟﯽ در اﺛﺮ زوال ﺷﺪﯾﺪ 96 ﺳﺎﻋﺖ اﯾﻦ داﻣﻨﻪ ﺗﻐﯿﯿﺮات ﺑﻪ 22 ﺗﺎ 28 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد رﺳﯿﺪ. ﺧﻮاب ﺑﺬر و زوال ﻣﯽﺗﻮاﻧﻨﺪ داﻣﻨﻪی دﻣﺎﯾﯽ ﺟﻮاﻧﻪزﻧﯽ را ﮐﺎﻫﺶ دﻫﺪ.

quantification of the effects of aging on cardinal temperatures of echinops seed germination using nonlinear models (echinops spp)

in order to determine the cardinal temperature of accelerated aging seeds of globe thistle, this study was carried out as factorial based on a completely randomized design with three replications at khuzestan university of agriculture and natural resources. the first factor was seed aging at 5 levels (0, 24, 48, 72, and 96 hours) and germination temperatures at 8 levels (5, 10, 15, 20, 25, 30, 35, and 40°c). the results showed that the percentage and speed of germination were affected by the interaction between temperature and aging. the highest germination percentage (98%) was observed at 20°c in normal seeds and 15 and 20°c at 24 and 48 h aging. the highest germination rate (0.496 germination per day) was also observed in normal seeds at 20 and 25°c. estimation of different non-linear models on germination rate also showed that among the evaluated models, the dent-like model was the best model (r2= 0.850 until 0.990, rmse= 0.040 until 0.12, aicc=-4.66 until -11.90) for germination of sugarcane seeds at different levels of aging. the base temperature of sugarcane was estimated to be 0.97°c in normal conditions, which increased to 1.8°c in 24 hours of aging and decreased again in higher aging (96 h) reach to 0.68oc. the optimum temperature of germination of this plant was 20 to 30 oc in normal conditions, which increased to 19 to 31oc due to mild aging (24 and 48 hours), but due to severe aging (96 hours), this range changes to 22 to 28oc. in general, it was found that seed dormancy and aging can reduce the germination temperature range seeds of wilde species.