Taher Saghali; Mohamd Esmail Amiri; Ali Imani; Hamed Rezaei; Ali Momenpour
Abstract
Almond has a high sensitivity to salt stress. Selection of a tolerant rootstock/scion is one of the ways to reduce the negative effects of salinity stress. In this experiment, the effects of salinity stress on some morphological, physiological and nutritional traits of some almond rootstocks was investigated ...
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Almond has a high sensitivity to salt stress. Selection of a tolerant rootstock/scion is one of the ways to reduce the negative effects of salinity stress. In this experiment, the effects of salinity stress on some morphological, physiological and nutritional traits of some almond rootstocks was investigated in a factorial experiment based on completely randomized design with two factors (8 levels of rootstock/scion compositions and five levels of salinity) in three replications at Horticultural Research Institute in 2017. The results showed that by increasing salinity from zero to 8 ds/m, the highest and lowest amount of reduction in root dry weight was observed in ‘Shahrood 12’/Tetra (37.8%) and GN15 (14.5%), respectively. The lowest and highest dry weight loss in the main branch was observed in the bitter almond seedling (38.2%) and ‘Shahrood 12’/ GN15 (47.9%), respectively. The highest amount of necrosis was observed in bitter almond seedling (28.98%) and the lowest value was in ‘Shahrood 12’/GF677 (9.9%). The lowest and highest changes in electrolyte leakage occurred at the rootstock of GF677 (30.74%) and GN15 (42.93%). The lowest and the highest changes in sodium were observed in the ‘Shahrood 12’/GF677 (51.2%) and in the bitter almond seedling (82%), respectively. The results also showed that by increasing salinity stress, the amount of root and leaf nutrient elements increased initially and then decreased with increasing salinity levels. Based on the results, ‘Shahrood 12’/GF677 is the most tolerable combination and the ‘Shahrood12’ grafted on bitter almond seedling is the most sensitive to salt stress.
fatemeh hosseinpoor; vali rabiei; mohammadesmaeil amiri; ali soleimani
Abstract
By considering short shelf life time of nectarine fruit and the importance of postharvest physiology, In order to study the effect of nano-packaging with hot water treatment to maintain qualitative characterestics and increase the storage life of nectarines cv. ‘Sunglo‘ an experiment was ...
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By considering short shelf life time of nectarine fruit and the importance of postharvest physiology, In order to study the effect of nano-packaging with hot water treatment to maintain qualitative characterestics and increase the storage life of nectarines cv. ‘Sunglo‘ an experiment was carried out in 2014. The experiment was designed in a CRBD (completely randomized block design) based on factorial with three replications and fruits qualitative characterestics every 10 days, during 40 days storage with 0-1C0 temperature, 90-95 percent RH were measured. The results showed that nano-packaging caused to maintain the vitamin C, titratable acidity and total soluble solids, and also nano-packaging compared to conventional packaging on weight loss, color quality and increasing browning was not significant effect. The amount of pH was decreased during 30 days of storage, then was increased to 40 days. The peroxidase enzyme activity increased with time, but this process in nano-packaging less than control treatment. The flavor index and carotenoids increased with time, but this process was significant decrease in carotenoids during 40 days of storage. Decrease in fruit firmness over time within 30 days of treatment with nano-packaging is lower. The results showed that nano packaging can be a suitable method to increasing the shelf life and maintain quality of nectarine fruit cv. ‘Sunglo‘.
Mehri Mashayekhi; Fariborz Habibi; Mohamad Amiri
Abstract
Mechanisms of drought stress tolerance of GF677 rootstock, peach and almond hybrid, (Prunus persica × Prunus amygdalus) were studied under in vitro conditions. Plantlets of GF677 rootstock were subcultured into the Murashige and Skoog (MS) solid proliferation medium containing 1 mg/l BA (6-Benzyladenine) ...
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Mechanisms of drought stress tolerance of GF677 rootstock, peach and almond hybrid, (Prunus persica × Prunus amygdalus) were studied under in vitro conditions. Plantlets of GF677 rootstock were subcultured into the Murashige and Skoog (MS) solid proliferation medium containing 1 mg/l BA (6-Benzyladenine) and 0.1 mg/l NAA (naphthaline acetic acid) in four drought stress levels 0 (control), 10, 20 and 30 g/l polyethylene glycol 6000 (corresponding to osmotic potentials 0, -0.2, -0.4 and -0.6 Mpa, respectively). After six weeks results showed that induced drought stress had a significant effect on measured parameters. By increasing drought levels in the culture medium, antioxidant enzymes activity (catalase and peroxidase), total protein content and proline content significantly increased; meanwhile soluble sugars had non-significant increasing in the different levels of drought. According to the results it can be concluded that, the most important mechanisms of drought tolerance of GF677 rootstock under in vitro conditions are the use of antioxidant defense system, increasing protein synthesis (enhancing genes expression) and proline accumulation and osmoregulation by soluble sugars had less important.
Fariborz Habibi; Mohammad Esmaeil Amiri
Abstract
Enzymaticactivity and biochemical responsesof two citrus rootstocks [sour orange (Citrus aurantium L.) and trifoliate orange (Poncirus trifoliata Raf.)] to in vitro salinitystress were studied. Explants of both rootstocks were transferred to Murashige and Skoog (MS) solid proliferation medium containing ...
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Enzymaticactivity and biochemical responsesof two citrus rootstocks [sour orange (Citrus aurantium L.) and trifoliate orange (Poncirus trifoliata Raf.)] to in vitro salinitystress were studied. Explants of both rootstocks were transferred to Murashige and Skoog (MS) solid proliferation medium containing 8.9 µM Benzyladenine (BA) and 0.5 µM Naphthaline Acetic Acid (NAA) supplemented with 0, 50, 100, 150, 200 mM of sodium chloride (NaCl) with six replicates. After six weeks, results showed that, rootstock, salinity levels and their interaction, had a significant effect on all of the measured parameters. Antioxidant enzymes activity such as: catalase, peroxidase, ascorbate peroxidase, proline content, soluble sugars and malondialdehyde (MDA) content increased in both rootstocks by increasing salinity level. The amounts of increasing in sour orange rootstock were greater than trifoliate orange, except for peroxidase enzyme and MDA. Total protein content decreased by increasing salinity level in both rootstocks. Sour orange rootstock has higher total protein content than trifoliate orange. According to the results, sour orange rootstock was more tolerant to salt stress.