Screening for Heat Tolerance in the Genus Lycopersicon1

Abstract

Less than 1% (38 of 4050 accessions) of the world collection of the garden tomato (Lycopersicon esculentum Mill.) and related Lycopersicon species displayed a high level of heat tolerance based on fruit setting ability at high temperature. Thirty of these heat-tolerant accessions belong to L. esculentum, 7 to L. pimpinellifolium and 1 is a cross between L. esculentum and L. pimpinellifolium.

Climate Change Effects on Sustainable Vegetable Production in India: A Review

“…To match the demands of a changing climate, more heat-tolerant cultivars are needed and these cultivars must be able to equal conventional, non-heat-tolerant types yields in non-stressful environments. Usually, only 1% or less of the germplasms or screened lines exhibit significant heat tolerance [47].…”

Screening for Flooding Tolerance in the Genus Lycopersicon

“…lems, high temperature and heavy rainfall limit production during this period. High tem perature usually prevents fruit setting; how ever, recently developed heat-tolerant culti vars may overcome this problem (8,9). Even so, heavy rainfall may damage the aerial parts of plants directly, and a short period of flood ing due to heavy rainfall frequently kills plants or reduces productivity.…”

“…Since the screening was carried out only under AVRDC conditions, the tolerant accessions must be re-examined under as many environmental conditions as possible to determine their consistency and range of adaptation. Except L-125, all of these accessions are heat sensitive in terms of fruit setting ability under high temperature conditions (8). Therefore, the combination of flood tolerance for plant survival and heat to lerance for fruit setting ability is desirable in order to improve tomato varieties for the hot and humid tropics.…”