List of Articles Leaf chlorophyll index

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  1 - Effect of plant density on some growth and physiological responses, and antioxidant enzymes activities of chickpea (Cicer arietinum L.) under different irrigation levels
  Mohammad Barzali Mohammad Nasri Maziyar Karimi Far
  In order to investigate the effect of different levels of plant density and irrigation on some morphologic and physiologic responses and antioxidants activities in chickpea cv. Hashem, an experiment was conducted at Goonbad-e-Kavoos region during 2012-2013 cropping seas More

  In order to investigate the effect of different levels of plant density and irrigation on some morphologic and physiologic responses and antioxidants activities in chickpea cv. Hashem, an experiment was conducted at Goonbad-e-Kavoos region during 2012-2013 cropping season. Treatments were arranged as split plot in randomized complete block design with four replications. Different irrigation regime levels (rainfed without irrigation, irrigation at flowering stage, and irrigation during pod filling stage) were assigned to main plots and sub-plots comprised of different plant densities (20, 30, 50, and 70 plants/m2). Results showed that different irrigation regimes significantly affected traits except for days to 50% flowering and plant height but plant density factor had significant impacts only on days to 50% flowering, plant height, days to physiologic maturity, seed yield, biologic yield, and leaf chlorophyll index. Results showed that irrigation caused significant increase in leaf relative water content and leaf chlorophyll index while it decreased grain protein content, superoxide dismutase and catalase activities. Maximum and minimum grain protein contents were produced in no-irrigation and irrigation during pod filling stage, respectively. Meanwhile, the maximum and minimum grain yield was gained by irrigation at flowering stage and rainfed without irrigation, respectively. Under plant density levels, the maximum and minimum grain yield was produced in 70 plants/m2 and 20 plants/m2, respectively. Irrigation at flowering stage × 70 plants/m2 had the highest grain yield among all treatments of the study.   Manuscript profile
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  2 - Investigation of some physio-morphological traits of purslane (portulaca oleracea L.) landraces under drought stress
  Elham Azizi Younes Rezapour mansooreh kermani ali masoomi
  10.30495/iper.2021.679527
  Purslane (Portulaca Oleracea L.) is a valuable medicinal plant growing in hot and dry conditions. Since drought stress is one of the most important factors limiting the production of agricultural products in these regions, this study aimed to evaluate the tolerance of d More

  Purslane (Portulaca Oleracea L.) is a valuable medicinal plant growing in hot and dry conditions. Since drought stress is one of the most important factors limiting the production of agricultural products in these regions, this study aimed to evaluate the tolerance of different purslane landraces to drought stress in the greenhouse of Payame Noor University of Daregaz during the spring 2016. The experiment was as factorial based on completely randomized design with four levels of drought stress (field capacity, 75% FC, 50% FC and 25% FC), 5 landraces of purslane (Qom, Kalat, Sabzevar, Yazd, Gachsaran), and with three replications. The studied traits were relative water content, membrane sustainability index, photosynthetic pigment contents, chlorophyll sustainability index (the amount of chlorophylls and carotenoids), proline content, soluble carbohydrates, and fresh and dry weight of roots in two stages of vegetative and reproductive growth. Results showed that an increase in water stress level decreased the relative water content and cell membrane stability index while increasing the leaf chlorophyll index, carotenoid content, proline, and carbohydrates in different landraces of purslane. Results also indicated that the landraces of Gachsaran and Yazd had higher membrane stability index, lower RWC, and lower chlorophyll content under stress. Among the studied landraces, Qom and Kalat showed significant superiority compared to Sabzevar, Yazd and Gachsaran landraces in terms of proline and soluble carbohydrates. Also, the results showed that with increasing drought stress, fresh and dry weight of roots, leaves, and stems reduced at vegetative and generative stages of plant development such that the highest morphological and physiological traits in two stages of vegetative and reproductive growth were observed in 75% and 100% of field capacity and the minimum levels of these traits were obtained in 25% of field capacity. In general, Qom and Kalat landraces were more tolerant to drought stress compared to other landraces while Gachsaran, Yazd, and Sabzevar due to the relatively weak response to drought stress in most of the measured traits, were evaluated as susceptible landraces to drought stress. Manuscript profile