Floral characteristics of heat-tolerant and heat-sensitive tomato (Lycopersicon esculentum Mill.) cultivars at high temperature

Lohar, D.; Peat, W. E.

doi:10.1016/s0304-4238(97)00056-3

Cited by 48 publications

(34 citation statements)

References 10 publications

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“…Only less than 3 % of the produce was sold to exporter which may be exported to India specially the rainy season tomato that was difficult to produce in Terai area due excessive heat and water lodged condition. To avoid all these condition plastic house control rainfall and water logged condition and organic tomato farming could control to some extent (Letourneau and Goldstein, 2001 (Lohar and Peat, 1998). This was the main reason that there were no vegetables grown and marketed ten years ago in the case of Kapilbastu (Adhikari and Basnyat, 1998) .…”

Section: Percentage Of Sample Household Growing Vegetable In Differenmentioning

confidence: 99%

Commercial Vegetable Farming: An Approach for Poverty Reduction in Nepal

et al. 2016

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Poverty reduction of farmers from Kapilbastu and Kaski districts were evaluated with respect to the vegetable farming where PRISM (Prosperity Realization through Irrigation and Smallholder Markets) technology was implemented. After the implementation of PRISM there has been considerable increase in vegetable farming area in both districts. Numbers of vegetable crops grown were increased with respect to yield and net return from both the winter and summer vegetables. With the opening of organized markets and large scale increase in income, farmers were attracted towards vegetable cultivation that provided wide range of vegetables for consumers as well. Earlier farmers cultivated vegetables only when there would be fallow land after the harvest of main season cereal crops while after the adoption of new technology farmers grew vegetables all the year round. Among the popular vegetables during summer was cucumber in the hills and okra in the Terai covering more land than other vegetables crops in the study area. These crops help farmers achieve net return of NRs.25240.6 and from NRs. 20425.4 per Ropani in Kaski and Kapilbastu, respectively. Land area under vegetables crops were increased by 6 times in Kaski and 12 times in Kapilbastu. This increase in net return has been found as a result of creating better marketing system developed by the activity of the PRISM. Similarly, involvement of household in summer season vegetable was not enough and farmers hired labor for commercial vegetables cultivation.

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Section: Percentage Of Sample Household Growing Vegetable In Differenmentioning

confidence: 99%

Commercial Vegetable Farming: An Approach for Poverty Reduction in Nepal

et al. 2016

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“…Although tomato plants can grow under a wide range of climatic conditions, optimal fruit set and fruit weight are limited to a much narrower temperature range. Fruit set is interrupted when day/night temperatures exceed 26ºC/20ºC and yield is subsequently reduced (Lohar and Peat, 1998). Heat tolerance in tomato was defined as ''the ability to set fruits under night temperatures not lower than 21ºC" (Villareal et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Impact of heat stress on Fusarium wilt (F. solani) incidence in cultivated tomato and related species

Alsamir¹,

Ahmad²,

Mahmood³

et al. 2017

Aust J Crop Sci

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The incidence of Fusarium wilt on tomato is increasing with rising global temperatures. To assess the impact of this disease, a factorial experiment of ten tomato genotypes grown at two temperatures and two levels of disease severity was established using hydroponics in a poly tunnel house. Fusarium wilt inoculum was used to promote disease and the heat treatment produced temperatures >40 o C for most of the growing season. Genotypes varied significantly for disease incidence and response to heat stress. Significant temperature x disease treatment interactions were observed for number of inflorescences per plant (IPP), fruit set ratio (FSR), number of fruits per plant (FPP), fresh fruit weight (FFW), plant dry weight (PDW) and disease severity index (DSI). A highly significant correlation (R 2 = 0.98) was observed between disease incidence under both control and high-temperature treatments, even though the treatments were significantly different. Biomass was reduced under both heat and disease stress and was correlated across treatments (R 2 = 0.86). The genotype LA3847, characterized by relatively low fruit set inhibition and high fruit yield, was classified as tolerant to both heat and disease stress. Concurrent selection for improved disease and heat tolerance appears possible as the disease severity index and the heat stress response were not correlated (R 2 = 0.11).Keywords: tomato, genetic variability, heat stress, Fusarium wilt. Abbreviations: IPP_ number of inflorescence per plant; DSI_ disease severity index; FSR_ fruit set ratio; FPP_ fruit per plant; FFW_ fresh fruit weight; PDW_ plant dry weight.

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“…Investigations to identify floral characteristics affected by high temperatures in tomato reveal many floral abnormalities such as stigma exertion without anthesis and persistent flowers without fruit-set, especially in heat sensitive genotypes. Sometimes anther cone splitting is also observed (Lohar and Peat, 1998). In addition to developmental abnormalities in male tissues, a reduced photosynthesis and hormonal balance in sink tissues have been related to tomato poor fruit set at high temperatures .…”

Section: Heat Stress Effects In Tomatomentioning

confidence: 99%

“…A recent study shows that in the absence of the HSFA1 transcription factor, a minimal yet significant level of acquired thermotolerance can still be attained in Arabidopsis mutants following acclimation, likely due to the induction of a small number of genes regulated by other transcription factors such as bZIP28 (Liu and Charng, 2012). Nevertheless, HSPs are of particular importance in thermotolerance reactions and act as molecular chaperones to prevent denaturation or aggregation of target proteins as well as facilitating protein refolding Lohar and Peat, 1998;Scharf et al, 2011) In many plant species, thermotolerance of cells and tissues after a heat stress is pretty much dependent upon induction of HSP70, though HSP101 has also been shown to be essential (Gurley, 2000). The enhanced expression of HSP70 was reported to assist in translocation, proteolysis, translation, folding, aggregation and refolding of denatured proteins (Gorantla et al, 2007;, while a methionine-rich chloroplast heat-shock protein has been shown to protect the thermolabile photosystem II and, consequently the whole-chain electron transport during heat stress .…”

Section: Molecular Aspects Of Heat Tolerancementioning

confidence: 99%

“…Investigations to identify floral characteristics affected by high temperatures in tomato reveal many abnormalities in anther development, especially in the tissues with important roles in pollen development and release, such as tapetum, stomium and circular cell clusters. (Lohar and Peat, 1998). The reduction in fruit set of tomato plants under high temperature was a result of disruptions in hormonal balance, sugar metabolism or proline transport during the critical phase of male gametophyte development .…”

Section: Heat Stress Effects On Flowering Crop Plantsmentioning

confidence: 99%

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Heat stress tolerance responses in developing tomato anthers

Bita

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Floral characteristics of heat-tolerant and heat-sensitive tomato (Lycopersicon esculentum Mill.) cultivars at high temperature

Cited by 48 publications

References 10 publications

Commercial Vegetable Farming: An Approach for Poverty Reduction in Nepal

Commercial Vegetable Farming: An Approach for Poverty Reduction in Nepal

Impact of heat stress on Fusarium wilt (F. solani) incidence in cultivated tomato and related species

Heat stress tolerance responses in developing tomato anthers

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