Foliar spray with sodium hydrosulfide and calcium chloride advances dynamic of critical elements and efficiency of nitrogen metabolism in Cucurbita pepo L. under nickel stress

2021 ◽  
Vol 283 ◽  
pp. 110052
Author(s):  
Maryam Valivand ◽  
Rayhaneh Amooaghaie
Keyword(s):  
Calcium Chloride ◽  
Nitrogen Metabolism ◽  
Cucurbita Pepo ◽  
Foliar Spray ◽  
Sodium Hydrosulfide ◽  
Critical Elements ◽  
Nickel Stress

scholarly journals Effects of Salicylic Acid and Calcium Chloride on Heat Tolerance of Poinsettia

HortScience ◽  
2019 ◽  
Vol 54 (3) ◽  
pp. 499-504 ◽  
Author(s):  
Kuan-Hung Lin ◽  
Shao-Bo Huang ◽  
Chun-Wei Wu ◽  
Yu-Sen Chang
Keyword(s):  
Salicylic Acid ◽  
Heat Stress ◽  
Calcium Chloride ◽  
Heat Tolerance ◽  
Foliar Spray ◽  
High Temperature Stress ◽  
Growth Patterns ◽  
Antioxidant Enzyme Activities ◽  
Bud Sprouting ◽  
Lateral Bud

Exogenous application of either salicylic acid (SA) or calcium chloride (CaCl2) to alleviate heat stress has been extensively studied. However, the effects of combined SA and CaCl2 treatment on the heat tolerance of poinsettia have been poorly studied. This study investigated the role of a foliar spray comprising SA and CaCl2 in managing heat tolerance of three poinsettia (Euphorbia pulcherrima Willd.) cultivars, Noel, Winter Rose (WR), and Ice Punch’ (IP). Plants were pretreated with SA, CaCl2, or combined SA and CaCl2 and then exposed to a temperature of 42 °C for 1 hour. Changes in the relative injury (RI) percentage, malondialdehyde (MDA) content, and antioxidant enzyme activities were determined. All plants were then placed in an environment-controlled greenhouse for 14 days and evaluated. Lateral bud sprouting (%), new leaf numbers, and phenotypic appearance were recorded. Results revealed that the three poinsettia cultivars varied in their appearance, morphological growth patterns, and ability to tolerate high-temperature stress. Plant growth of ‘Noel’ was more robust than that of ‘WR’ and ‘IP’, which were considerably affected by heat stress, resulting in brown, withered leaves and defoliation. In general, the effects of the combined application of SA and CaCl2 on heat-tolerant ‘Noel’ were superior to those of individual applications and no treatment (for control groups) in terms of the RI percentage, lateral bud sprouting (%), and appearance under heat stress. Application of combined SA and CaCl2 for ‘Noel’ plants was more beneficial for enhancing catalase activity and resulted in the effective alleviation of decreased malondialdehyde content under heat stress. Treatment including 200 μΜ SA and 10 mm CaCl2 may alleviate heat stress and may prove useful in breeding programs focused on improving poinsettia cultivars.

Effect of foliar spray of calcium chloride and boric acid on shelf-life of guava

2017 ◽  
Vol 74 (4) ◽  
pp. 586
Author(s):  
Anil Kumar ◽  
Navin Singh ◽  
K.K. Misra ◽  
Vishal Nirgude
Keyword(s):  
Boric Acid ◽  
Shelf Life ◽  
Calcium Chloride ◽  
Foliar Spray

scholarly journals Population decline in a ground-nesting solitary squash bee (Eucera pruinosa) following exposure to a neonicotinoid insecticide treated crop (Cucurbita pepo)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
D. Susan Willis Chan ◽  
Nigel E. Raine
Keyword(s):  
Cucurbita Pepo ◽  
Pesticide Exposure ◽  
Sublethal Effects ◽  
Population Decline ◽  
Foliar Spray ◽  
Risk Assessments ◽  
Seed Coating ◽  
Pollination Services ◽  
Neonicotinoid Insecticide ◽  
Ground Nesting

AbstractInsect pollinators are threatened by multiple environmental stressors, including pesticide exposure. Despite being important pollinators, solitary ground-nesting bees are inadequately represented by pesticide risk assessments reliant almost exclusively on honeybee ecotoxicology. Here we evaluate the effects of realistic exposure via squash crops treated with systemic insecticides (Admire-imidacloprid soil application, FarMore FI400-thiamethoxam seed-coating, or Coragen-chlorantraniliprole foliar spray) for a ground-nesting bee species (Hoary squash bee, Eucera pruinosa) in a 3-year semi-field experiment. Hoary squash bees provide essential pollination services to pumpkin and squash crops and commonly nest within cropping areas increasing their risk of pesticide exposure from soil, nectar, and pollen. When exposed to a crop treated at planting with soil-applied imidacloprid, these bees initiated 85% fewer nests, left 5.3 times more pollen unharvested, and produced 89% fewer offspring than untreated controls. No measurable impacts on bees from exposure to squash treated with thiamethoxam as a seed-coating or foliage sprayed with chlorantraniliprole were found. Our results demonstrate important sublethal effects of field-realistic exposure to a soil-applied neonicotinoid (imidacloprid) on bee behaviour and reproductive success. Soil must be considered a potential route of pesticide exposure in risk assessments, and restrictions on soil-applied insecticides may be justified, to mitigate impacts on ground-nesting solitary bee populations and the crop pollination services they provide.

scholarly journals Effect of Pre-harvest Calcium Chloride and Salicylic Acid Spray on Morphological and Biochemical Traits of Guava (Psidium guajava)

2021 ◽  
Author(s):  
Lochan Kaushik ◽  
Rahul Kumar ◽  
Dilip Kumar Reddy ◽  
Prashant Kaushik
Keyword(s):  
Salicylic Acid ◽  
Calcium Chloride ◽  
Fruit Set ◽  
Foliar Spray ◽  
Psidium Guajava ◽  
Fruit Weight ◽  
Cell Component ◽  
Biochemical Traits ◽  
Tropical Fruit ◽  
Nitrogen Phosphorus

Guava is a small, tropical fruit tree grown in various tropical and subtropical regions. Salicylic acid (SA) is a phenolic compound that enhances disease resistance and delays the fruit ripening process. Calcium is an essential cell component that delays ripening, particularly softening of the fruit. The effect of foliar spray of CaCl2, and SA, on the physical and biochemical traits of guava was investigated in the present investigation. The application of CaCl2 2% + SA 2mM was more effective as compared with both when applied alone. The data were recorded on fruit set (%), fruit weight (g), fruit length (cm), fruit diameter (cm), fruit yield (kg), ripening period (days), TSS, acidity, total sugar, ascorbic acid, nitrogen, phosphorus, potassium. CaCl2 2% + SA 2mM was showed better performance in all cases, followed by SA 2mM and CaCl2 2%. Overall, this work determines the influence on guava's essential traits by pre-harvest calcium chloride and salicylic acid.

Efficacy of calcium chloride and arginine foliar spray in alleviating terminal heat stress in late-sown wheat (Triticum aestivum L.)

2019 ◽  
Vol 157 (6) ◽  
pp. 537-549
Author(s):  
A. Roy Chowdhury ◽  
M. Ghosh ◽  
M. Lal ◽  
A. Pal ◽  
K. K. Hazra ◽  
...  
Keyword(s):  
Heat Stress ◽  
Grain Yield ◽  
Calcium Chloride ◽  
Abiotic Factors ◽  
Flag Leaf ◽  
Plant Stress ◽  
Foliar Spray ◽  
Grain Filling ◽  
Synthetic Compounds ◽  
Terminal Heat Stress

AbstractTerminal heat stress leads to sizeable yield loss in late-sown wheat in tropical environments. Several synthetic compounds are known to counteract plant stress emanating from abiotic factors. A field experiment was conducted in Sabour (eastern India) during 2013–2016 to investigate the field efficacy of two synthetic compounds, calcium chloride (CaCl2) and arginine, for improving grain yield of two contrasting wheat cultivars (DBW 14 and K 307) facing terminal heat stress. For this, foliar spray of 18.0 mM CaCl2 at booting (CCB) or anthesis (CCA), 9.0 mM CaCl2 at both booting and anthesis (CCB+A), 2.5 mM arginine at booting (ARGB) or anthesis (ARGA) and 1.25 mM arginine at both booting and anthesis (ARGB+A) treatments along with no-spray and water-spray treatments were evaluated in late-sown wheat. The highest grain yield was recorded in treatment CCB+A, followed by CCA and ARGB+A. However, the effect of these compounds was marginal on grain yield when applied only at the booting stage. Grains/ear and thousand-grain weight were found to be the critical determinants for yield in late-sown wheat. During the anthesis to grain filling period, flag-leaf chlorophyll degradation and increase in relative permeability in no-spray treatment were 34–36% and 29–52%, respectively, but these values were reduced considerably in CCB+A treatment followed CCA. Thus, foliar spray of 9.0 mM CaCl2 both at booting and anthesis stages may be recommended for alleviating the negative impacts of terminal heat stress in late-sown wheat and improving its productivity (>13%).

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