فهرس المقالات Physiological properties

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  • صفحة الملخص
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  1 - Evaluation of the response of rice cultivars in some functional and physiological traits using different nutritional sources (chemical, organic) under drought stress conditions
  Jaber Mehdiniya afra Yousef Niknejad Hormoz Fallah Amoli Davood Barari Tari
  10.30495/ijpp.2022.1897616.1217
  A factorial experiment was performed as a randomized complete block design with three replications in Sari Research Farm during 2016-2017. Three levels of stress, including drought stress on the time of tillering initiation (15 days after transplanting), in remobilizati أکثر

  A factorial experiment was performed as a randomized complete block design with three replications in Sari Research Farm during 2016-2017. Three levels of stress, including drought stress on the time of tillering initiation (15 days after transplanting), in remobilization stage (the end of flowering and the beginning of grain filling stage), and no drought stress (control), were considered as the main factors. Four fertilizer sources, including vermicompost, Azolla compost, humic acid, and chemical fertilizers of nitrogen, phosphorus, potassium, along with two local Tarom and Shirodi cultivars, were considered as the sub-factor. The maximum paddy seed yield was obtained in the non-stress condition using humic acid in Shirodi and local Tarom cultivars. The highest harvest index in the first year under non-stress conditions was obtained from the use of humic acid fertilizer resources in the Shirodi cultivar (54.08%), and the maximum concentrations of chlorophylls a, b, and total chlorophyll were obtained under non-stress conditions. With applying stress, especially drought stress at the complete heading stage, the chlorophyll concentration significantly reduced, so that under drought stress at the heading stage, chlorophyll a, b, and total chlorophyll concentrations reduced by 3.8, 2.6, and 3.3, respectively, compared with the control. the use of humic acid is recommended to obtain the maximum functional and physiological traits of the studied rice cultivars under drought stress. تفاصيل المقالة
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  2 - Effect of Drought and Salinity Stress on Morpho-physiologycal Variation of the Iranian Endemic Stachys multicaulis Benth. in Different Soil Textures
  Habib Yazdanshenas Mohammad Jafary Ali Tavili Hossein Arzani Hossain Azarnivand
  Adaptation of plants under drought and salinity stress depends directly on the type of soil texture. Therefore, in this research, the morpho-physiological variations of Stachys multicaulis,an Iranian wild endemic plant species, were investigated in different soil textur أکثر

  Adaptation of plants under drought and salinity stress depends directly on the type of soil texture. Therefore, in this research, the morpho-physiological variations of Stachys multicaulis,an Iranian wild endemic plant species, were investigated in different soil textures under drought and salinity stress. For this purpose, plants were cultivated in three different light, medium and heavy soil textures under pot condition (outside the greenhouse near the plant original habitat) in 2016. Then, a set of drought stress (3 day intervals of irrigation; 3 to 15 days) and salinity stress (0, 5, 10, 15, 20 and 25 ds/m- NaCl) was used in two separate factorialexperiments based on a completely randomized design with four replications. The results showed that both drought and salinity had significant effects on morpho-physiological properties of S. multicaulis (p<0.01) based on type of soil texture. All of traits had higher performance in heavy soil texture except trichome length. For 15 day interval of irrigation, higher values of plant biomass, plant greenness, leaf length/width ratio, leaf angle, and node distance as 8.25g, 28.1%, 4.17, 55°, 1.5cm respectively were obtained in heavy soil texture. Similarly, for salinity of 25 ds/m, higher values of same traits as 7.7g, 25%, 3.9, 50°, and 1.4cm, respectively were obtained in heavy soil texture. Both drought and salinity stress had no significant effect (p<0.01) on leaves trichome number, trichome length, floret number per plant and branch number per plant in all three soil textures. The morphological variations of the plant occurred with greater intensity in salinity stress and it was concluded that plant tolerance to salinity was lower than drought. تفاصيل المقالة