Stomatal Movement in Response to Root Zone Temperature in Purple Heart (Tradescantia pallida)
محورهای موضوعی : مجله گیاهان زینتی
Nabiyollah Ashrafi
1
(Ph.D Student, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, P.O. Box 465, Khorramabad, Iran.)
Abdolhossein Rezaei Nejad
2
(Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, P.O. Box 465, Khorramabad, Iran)
کلید واژه: Photosynthesis, Heat shock, Root zone temperature, Stomatal Conductance,
چکیده مقاله :
The effects of root temperatures (25, 35 and 45°C) and temperature duration (30, 60 and 90 min) on net photosynthesis rate, stomatal conductance and transpiration rate in Tradescantia pallida were investigated. The experiment was conducted under controlled conditions with factorial arrangement based on a completely randomized design (CRD) and four replications. Result showed that, net photosynthesis rate was not significantly different between plants treated with 25 and 35°C. However, aperture area and width increased at 35°C and declined sharply at 45 °C as compared with that at 25 °C. Net photosynthesis rate and stomata1 conductance of plants treated with 45°C decreased to 76 and 68%, respectively, as compared with those at 35°C. Stomatal aperture area of plants treated with 35°C was 27% and 320% higher than those treated with 25 and 45°C, respectively. Stomatal resistance of plants treated with high temperature (45°C) were higher (174%) than those treated with 35°C. In 35 °C, aperture area of plants after 30 min was 61% and 45% higher than those after 60 and 90 min exposure, respectively. The results revealed that, a heat shock of roots at 45°C could lead to a significant decrease in stomatal conductance (by 81%) and transpiration rate (by 60%) as compared with those at 35°C. Overall, the results suggest that the root temperature affects leaf gas exchange and stomatal behavior and has to be taken into account in plant production system, in particular, hydroponics.
تاثیر دمای محیط ریشه (25، 35 و 45 درجه) و مدت تیمار گرمایی (30، 60 و 90 دقیقه) بر تبادلات گازی و رفتار روزنه­ای در برگ گیاه برگ بیدی بررسی گردید. آزمایش در محیط کنترل شده و به صورت فاکتوریل بر پایه طرح کاملا تصادفی با چهار تکرار انجام گرفت. نتایج نشان داد میزان فوسنتز در گیاهان تیمار شده با دمای 25 و 35 درجه اختلاف آماری معنی­داری نداشته است. اگرچه، مساحت منفذ روزنه و عرض منفذ روزنه در دمای 35 درجه در مقایسه با دمای 25 درجه افزایش نشان داد ولی در دمای 45 درجه به شدت کاهش داشته است. همچنین میزان فتوسنتز و هدایت روزنه­ای گیاهان تیمار شده با 45 درجه در مقایسه با دمای 35 درجه به ترتیب 76 و 68 درصد کاهش داشته است. مساحت منفذ روزنه در گیاهان تیمار شده با دمای 35 درجه در مقایسه با دمای 25 و 45 درجه به ترتیب 27 درصد و 320 درصد بیشتر بوده است. مساحت منفذ روزنه بعد از 30 دقیقه تیمار با دمای 35 درجه، به­ترتیب 61 و 45 درصد بیشتر از زمان 60 و 90 دقیقه تیمار بوده است. شوک گرمایی 45 درجه در محیط ریشه در مقایسه با دمای 35 درجه موجب کاهش هدایت روزنه ای (81 درصد) و تعرق (60 درصد) می­گردد. به طور کلی، نتایج نشان داد که دمای ریشه بر رفتار روزنه­ای و تبادلات گازی موثر بوده و می­تواند در تولید گیاهان گلخانه­ای و در برنامه تغذیه مورد توجه قرار گیرد.
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