Relationship Between Cold Tolerance during Seed Germination and Vegetative Growth in Tomato: Analysis of Response and Correlated Response to Selection

Abstract

<jats:p>The genetic relationship between cold tolerance (CT) during seed germination and vegetative growth in tomato (<jats:italic>Lycopersicon esculentum</jats:italic> Mill.) was determined. An F<jats:sub>2</jats:sub> population of a cross between accession PI120256 (cold tolerant during both seed germination and vegetative growth) and UCT5 (cold sensitive during both stages) was evaluated for germination under cold stress and the most cold tolerant progeny (the first 5% germinated) were selected. Selected progeny were grown to maturity and self-fertilized to produce F<jats:sub>3</jats:sub> families (referred to as the selected F<jats:sub>3</jats:sub> population). The selected F<jats:sub>3</jats:sub> population was evaluated for CT separately during seed germination and vegetative growth and its performance was compared with that of a nonselected F<jats:sub>3</jats:sub> population of the same cross. Results indicated that selection for CT during seed germination significantly improved CT of the progeny during germination; a realized heritability of 0.75 was obtained for CT during seed germination. However, selection for CT during germination did not affect plant CT during vegetative growth; there was no significant difference between the selected and nonselected F<jats:sub>3</jats:sub> populations in either absolute CT [defined as shoot fresh weight (FW) under cold stress] or relative CT (defined as shoot FW under cold as a percentage of control). Results indicated that, in PI120256, CT during seed germination was genetically independent of CT during vegetative growth. Thus, to develop tomato cultivars with improved CT during different developmental stages, selection protocols that include all critical stages are necessary.</jats:p>

Crop breeding for salt tolerance in the era of molecular markers and marker‐assisted selection

“…, Khan ). Similar results have been reported for other abiotic stresses, including cold tolerance (Foolad and Lin , ). The overall conclusion from these studies is that to gain a better understanding of the genetic control of stress tolerance (including ST) and to improve plant tolerance, specific ontogenetic stages throughout the plant life cycle should be evaluated separately for the assessment of tolerance and identification, characterization and utilization of useful genetic components.…”

Expression of the maize GALACTINOL SYNTHASE gene family: (I) Expression of two different genes during seed development and germination

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Assessment of a set of rapeseed (Brassica napus L.) varieties under waterlogging stress at different plant growth stages

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