Plant Productions

Effects of potassium silicate on some morphological and physiological traits of dichondra (Dichondra repens) cover plant grown under water deficit

Mahdieh Niazbal; Sepideh Kalatejari; Foad Fatehi; Marjan Diyanat

Volume 45, Issue 4 , February 2023, , Pages 505-517

https://doi.org/10.22055/ppd.2023.38291.2061

Abstract

IntroductionDichondra repens is a low growing, creeping perennial that spreads by underground runners. This plant is usually planted instead of lawn in warm areas and is also suitable ... Read More IntroductionDichondra repens is a low growing, creeping perennial that spreads by underground runners. This plant is usually planted instead of lawn in warm areas and is also suitable as a cover to fill the gap between the pavements and for planting in rock gardens. Soil drought is one of the major abiotic factors that limit crop growth and productivity worldwide. Drought stress triggers production of reactive oxygen species (ROS) that cause oxidative damage to proteins, membrane lipids and other cellular components. Silicon (Si) is the second most prevalent element after oxygen in the soil. The beneficial effect of the silicon is well documented for several agricultural crops. Materials and MethodsThe present study was conducted to assess the effect of potassium silicate on growth characteristics of Dichondra repens under water deficit as factorial in a completely randomized design in 2018. Water deficit was applied in three levels (100%, 66% and 33% Field capacity) and potassium silicate in four levels (0, 50, 100 and 200 mg/l). Data analysis was performed with SAS software. Mean data were compared with Duncan test at 5% level. Plant height was measured from the collar to the tip of the plant with a caliper. To measure the fresh weight of the shoot, the plant was weighed after harvesting with a digital scale. To measure the roots, the roots were gently removed from the soil and weighed with a digital scale. Leaf chlorophyll was measured by Arnon (1949) method at 480, 663 and 645 nm with a spectrophotometer. Catalase activity was measured by Eising and Gerhardt (1989) method. Measurement of superoxide dismutase activity by Dhindsa et al. (1982) was performed. Potassium concentration was measured by flame photometry. Elliott and Snyder (1991) method was used to measure leaf silicon concentration. Results and DiscussionPlant height decreased by 38% in 33% field capacity and non-use of potassium silicate interaction in comparison of 100% field capacity and 200 mg/l potassium silicate interaction. Potassium silicate 200 and 100 mg/l increased chlorophyll content in 100 and 66% of field capacity. Catalase and superoxide dismutase enzymes showed the highest activity in 33% field capacity and 200 mg/l potassium silicate interaction and 33% field capacity and no potassium silicate interaction, respectively. The lowest relative leaf water content was observed in 33% field capacity and no potassium silicate interaction and there is no significant difference between it and potassium silicate at 50 mg/l. The highest amount of potassium was observed in the treatment of 66% of field capacity and 50 mg/l of potassium silicate, which was not significantly different from the interaction of 100% of field capacity and 100 mg/l of potassium silicate. The highest amount of silicon was observed in treatment of 100% of field capacity and 200 mg/l of potassium silicate, which was significantly different from other treatments. ConclusionTreatment of 100% field capacity and potassium silicate at 200 mg/l was identified as the most efficient treatment in improving the growth characteristics of dichondra. So with proper management 66% field capacity and 100 mg potassium silicate treatment can be replaced with 100% field capacity potassium silicate at 200 mg/l.

Heat tolerance evaluating of wheat cultivars using physiological characteristics and stress tolerance indices in Ahvaz climatic conditions

M. Omidi; M.R. Siahpoosh; R. Mamghani; M. Modarresi

Volume 38, Issue 1 , May 2015, , Pages 103-113

https://doi.org/10.22055/ppd.2015.11135

Abstract

In order to evaluate the heat tolerance of 11 wheat cultivars, an experiment was conducted during 2010-2011 under two conditions, normal (normal sowing) and heat stress (late sowing), ... Read More

Allelopathic effects of walnut decomposed leaf extract on some physiological traits of wild oat (Avena fatua L.)

E. Ghojavand1; A. Danesh-Shahraki2; A. Tadayon

Volume 37, Issue 3 , December 2014, , Pages 13-21

Abstract

In order to evaluate the allelopathic effects of decomposed walnut leaf extract on some physiological traits of wild oat (Avena fatua L.) an experiment was conducted in Shahrekord University ... Read More

Studying the effect of kaolin on fluorescence and chlorophyll content in leaves of olive plants (Olea europaea L. cv Dezful) under water deficit sress

E. Khaleghi; K. Arzani; N. Moallemi; M. Barzegar

Volume 37, Issue 2 , September 2014, , Pages 127-139

Abstract

With respect to arid and semi-arid climate of Iran, using methods which mitigate detrimental effects of water deficit on horticultural products would be of significant importance. Kaolin ... Read More With respect to arid and semi-arid climate of Iran, using methods which mitigate detrimental effects of water deficit on horticultural products would be of significant importance. Kaolin is an anti-transpiration material the application of which has been expanded during the recent years. For this purpose, the effect of three different levels of kaolin (0, 3 and 6%) as well as three different levels of irrigation (100, 65 and 40% potential ETcrop) on chlorophyll content and chlorophyll fluorescence in olive leaves “Dezful’ were examined as factorial test based on a completely randomized design in three replications (each replication including 3 pots) in the greenhouse of Horticulture Department, Faculty of Agriculture, Tarbiat Modares University (Tehran, Iran). The obtained results demonstrated that chlorophyll a and total chlorophyll were reduced under water deficit. The amount of reducing of chlorophyll a and total chlorophyll in 80 days after treatment was greater than that in 40 days after treatment. In addition, the amount of total chlorophyll in the sprayed plants with 6% kaolin was the highest (1.425 mg/g fresh weigh of leaf) in 80 days after treatment. Furthermore, it was shown that by reducing of water content to 65 and 40% ETcrop the content of chlorophyll “a” was greater than the plants which were sprayed at kaolin concentrations of 3 and 6% in comparison with the control. Meanwhile, the results of fluorescence parameters showed that maximum fluorescence indices (Fm), fluorescence variable (Fv) and ratio of fluorescence variable to maximum fluorescence (Fv/Fm) were reduced under drought stress. However, the kaolin treatment had no significant effect on these indices. Generally, it can be expected that spraying of the olive gardens in Iran with kaolin, especially in regions exposed to water deficit can moderate the drought stress and mitigate the detrimental effects of water deficit, while improving photosynthesis efficiency of the leaf.

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Keywords = Chlorophyll content

Effects of potassium silicate on some morphological and physiological traits of dichondra (Dichondra repens) cover plant grown under water deficit

Abstract

Heat tolerance evaluating of wheat cultivars using physiological characteristics and stress tolerance indices in Ahvaz climatic conditions

Abstract

Allelopathic effects of walnut decomposed leaf extract on some physiological traits of wild oat (Avena fatua L.)

Abstract

Studying the effect of kaolin on fluorescence and chlorophyll content in leaves of olive plants (Olea europaea L. cv Dezful) under water deficit sress

Abstract