کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9489581 | 1628755 | 2019 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
MDATSSCarOChl bTPCChl aAntioxidants - آنتی اکسیدانOsmolytes - اسمولیت هاSucculence - انقباضTotal phenolic compounds - ترکیبات فنلی کلTotal soluble sugars - قندهای محلول در کلmalondialdehyde - مالون دی آلدهیدPRO - نرم افزارGrowth response - پاسخ رشدProline - پرولینTotal flavonoids - کل فلاونوئیدهاTotal carotenoids - کل کاروتنوئیدهاChlorophyll a - کلروفیل achlorophyll b - کلروفیل بWater deficit - کمبود آب
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش باغداری
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species Responses of succulents to drought: Comparative analysis of four Sedum (Crassulaceae) species](/preview/png/9489581.png)
چکیده انگلیسی
The increasing frequency and intensity of drought periods is a serious threat for agriculture, prompting research to select and develop crop species and cultivars with enhanced water stress tolerance. Drought responses were studied in four ornamental Sedum species under controlled greenhouse conditions, by withholding watering of the plants for four weeks. Determination of growth parameters (stem length, fresh weight) allowed establishing the relative degree of tolerance of the selected species as S. spurium > S. ochroleucum > S. sediforme > S. album. The levels of photosynthetic pigments (chlorophylls a and b and total carotenoids), oxidative stress [using malondialdehyde (MDA) as a marker], non-enzymatic antioxidants (total phenolic compounds and total flavonoids) and putative osmolytes [proline (Pro) and total soluble sugars] were measured in leaves of control and stressed plants, to correlate drought tolerance with the activation of specific response mechanisms. The results obtained indicate that a higher tolerance to water deficit in Sedum is associated with: a) relatively lower stress-induced degradation of chlorophylls and carotenoids, especially of the latter (which did not decrease in water-stressed plants of S. spurium, the most tolerant species, whereas it was reduced to about 40% of the control in S. album, the most sensitive); b) no increase in MDA levels, reflecting the lack of drought-induced oxidative stress; and c) higher Pro contents in the non-stressed controls of the taxa most resistant to drought, which could be the basis of constitutive mechanisms of tolerance. However, Pro contribution to drought tolerance in Sedum must be based on an 'osmoprotectant' role, as its concentrations, below 16âμmolâgâ1 DW in all cases, are too low to have any significant osmotic effect. The identification of these biochemical markers of drought tolerance should help to develop rapid and efficient screening procedures to select Sedum taxa with enhanced tolerance when comparing different species within the genus, or different cultivars within a given species.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Scientia Horticulturae - Volume 243, 3 January 2019, Pages 235-242
Journal: Scientia Horticulturae - Volume 243, 3 January 2019, Pages 235-242
نویسندگان
Aleksandra KoźmiÅska, Mohamad Al Hassan, Alina Wiszniewska, Ewa Hanus-Fajerska, Monica Boscaiu, Oscar Vicente,