تعیین حد آستانه تحمل به تنش شوری و برخی ویژگی‌های کمی و فیزیولوژیکی گیاه کاسنی (.cichorium intybus l)

گیاهان دارویی از جمله گیاه کاسنی از گیاهان اقتصادی و ارزشمند بوده که لازم است نسبت به ارزیابی تحمل به تنش این گیاه مطالعات کافی صورت گیرد. به این منظور جهت مطالعه تحمل به شوری گیاه کاسنی آزمایشی به‌صورت طرح کاملاً تصادفی با 3 تکرار به‌صورت گلدانی در گلخانه مرکز ملی تحقیقات شوری در سال زراعی 99-1398 انجام شد. تیمارهای پنج سطح شوری آب آبیاری شامل آب شهر (شاهد)، 3، 6، 9 و 12 دسی‌زیمنس بر متر بود. تیمارهای شوری از طریق رقیق‌سازی آب‌شور منطقه اطراف اردکان با آب شرب تهیه شد و بعد از سبز شدن گیاه به مدت 8 ماه بر گیاهان اعمال شد. سپس به‌منظور برآورد آستانه تحمل به تنش شوری و کاهش 50 درصد عملکرد از مدل موسهافمن استفاده شد. در انتهای آزمایش برخی صفات کمی گیاه مورد ارزیابی قرار گرفت. نتایج حاکی از آن بود که اعمال سطوح شوری به‌طوری معنی‌داری سبب کاهش تمامی ویژگی‌های موردبررسی شد. به‌طوری‌که افزایش شوری از تیمار شاهد تا شوری 12 دسی‌زیمنس بر متر سبب کاهش 50 درصد ارتفاع بوته، 59 درصد وزن خشک اندام هوایی، 76 درصد وزن خشک ریشه و 72 درصد تعداد آکن در بوته شد. همچنین با افزایش شوری از تیمار شاهد تا شوری 9 دسی‌زیمنس بر متر سبب کاهش 9.68 درصد محتوای آب نسبی و افزایش نشت یونی گیاه به میزان 37.47 درصد شد. افزایش شوری از شاهد تا 12 دسی‌زیمنس بر متر تاثیر معنی‌داری بر کاهش نسبت پتاسیم به سدیم به میزان 96 درصد داشت. کاهش 50 و 100 درصد عملکرد ریشه کاسنی به ترتیب در شوری 5.91 و 14.66 دسی‌زیمنس بر متر حاصل شد. به‌طورکلی با توجه به نتایج به‌دست‌آمده به نظر می‌رسد گیاه کاسنی تحمل بالایی نسبت به شوری ندارد.

Evaluation of salinity tolerance threshold and some quantity and physiological characteristics of Chicory (Cichorium intybus L.)

IntroductionSoil salinity and associated problems constitute one of the major abiotic constraints in global production and are particularly critical in semiarid and arid areas. In areas faced with water scarcity, it is common practice to utilize saline groundwater in irrigated agriculture. Chicory is a flowering plant in the dandelion family that is characterized by a tough, hairy stem, light purple flowers and leaves that are commonly used in salads. Chicory coffee tastes similar to coffee but has a flavor that’s often described as slightly woody and nutty. Hence, the present research was aimed to evaluate the effects of salinity stress on some of chicory of quantity and physiological characteristics. Matherial and MethodIn order to evaluate the salinity tolerance of Chicory, an experiment was conducted in a completely randomized design with 3 replications in a pot in the greenhouse of the National Salinity Research Center during 201920. Experimental treatment includes 5 levels 0.44 (control), 3, 6, 9 and 12 dS m1. In the present study, some growth traits, height of plant, leaf area, shoot dry weight, root dry weight, number of aken per plant, relative water content, ion leakage, potassium, sodium and ratio of K/Na were measured. Results and discussionThe results showed that the application of salinity levels significantly reduced all the studied traits. Regarding increasing salinity from control to salinity of 12 dS m1 reduced plant height by 50%, shoot dry weight by 59%, root dry weight by 76% and number of aken per plant by 72%. Also, with increasing salinity level from 0 to 9 dS m1 caused decreasing relative water content by 9.68% and increasing ion leakage by 37.47%. Increasing salinity levels from control to 12 dS m1 was affected as significantly on decreasing ratio of potassium to sodium (96%). Also, 50% and 100% reduction in root yield was obtained at salinity of 5.91 and 14.66 dS m1, respectively. In general, according to the results, it seems that Chicory does not have high tolerance to salinity. The results showed that the application of salinity levels significantly reduced all the studied traits. Regarding increasing salinity from control to salinity of 12 dS m1 reduced plant height by 50%, shoot dry weight by 59%, root dry weight by 76% and number of aken per plant by 72%. Also, with increasing salinity level from 0 to 9 dS m1 caused decreasing relative water content by 9.68% and increasing ion leakage by 37.47%. Increasing salinity levels from control to 12 dS m1 was affected as significantly on decreasing ratio of potassium to sodium (96%). Also, 50% and 100% reduction in root yield was obtained at salinity of 5.91 and 14.66 dS m1, respectively. In general, according to the results, it seems that Chicory does not have high tolerance to salinity. Also, 50% and 100% reduction in root yield was obtained at salinity of 5.91 and 14.66 dS m1, respectively. In general, according to the results, it seems that Chicory does not have high tolerance to salinity. The results showed that the application of salinity levels significantly reduced all the studied traits. Regarding increasing salinity from control to salinity of 12 dS m1 reduced plant height by 50%, shoot dry weight by 59%, root dry weight by 76% and number of aken per plant by 72%. Also, with increasing salinity level from 0 to 9 dS m1 caused decreasing relative water content by 9.68% and increasing ion leakage by 37.47%. Increasing salinity levels from control to 12 dS m1 was affected as significantly on decreasing ratio of potassium to sodium (96%). Also, 50% and 100% reduction in root yield was obtained at salinity of 5.91 and 14.66 dS m1, respectively. In general, according to the results, it seems that Chicory does not have high tolerance to salinity.