Evaluation of potential morpho-physiological and biochemical indicators in selecting heat-tolerant tomato (Solanum lycopersicum Mill.) genotypes

Jalal Ud Din, Sami Ullah Khan, Ahmad Khan, Abdul Qayyum, Kashif Sarfraz Abbasi, Matthew A. Jenks

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A few degrees in temperature above the optimum can cause a considerable yield loss in tomatoes. A research experiment was conducted in which three tomato genotypes of (Solanum lycopersicum Mill.), ‘Suncherry Extra Sweet’ (Suncherry), ‘Walter’, and ‘CLN-2498d’, were evaluated for response to moderate high temperature at the reproductive stage. High temperature reduced the total number of fruits per plant, fruit size, number of seeds per fruit, seed setting, and relative ovule viability. However, high temperature increased proline accumulation and membrane thermo-stability in plant parts of the investigated genotypes. Fruit size and the number of seeds per fruit were reduced in all the genotypes, with the greatest reduction occurring in Suncherry. Similarly, viability of male and female gametes was also reduced in all of the investigated genotypes due to high temperature injury. The reduction in seed setting due to high temperature was greatest in ‘Suncherry’ and ‘Walter’, and least in ‘CLN-2498d’. Likewise, ovule viability was least reduced in ‘CLN-2498d’. The genotypes accumulating higher proline concentrations in reproductive parts and with enhanced membrane thermo-stability under high temperature likewise produced the highest fruit yield, and hence, exhibited high temperature tolerance.

Original languageEnglish (US)
Pages (from-to)769-776
Number of pages8
JournalHorticulture Environment and Biotechnology
Volume56
Issue number6
DOIs
StatePublished - Dec 1 2015
Externally publishedYes

Keywords

  • fruit set
  • gametes viability
  • heat-stress
  • membrane thermo-stability index
  • proline

ASJC Scopus subject areas

  • Biotechnology
  • Plant Science
  • Horticulture

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