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Article

Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait

1
Department of Plant Breeding, Research Centre for Biosystems, Land Use and Nutrition (IFZ), 35392 Giessen, Germany
2
NPZ Innovation GmbH, Hohenlieth-Hof, 24363 Holtsee, Germany
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(9), 508; https://doi.org/10.3390/agronomy9090508
Received: 28 June 2019 / Revised: 20 August 2019 / Accepted: 30 August 2019 / Published: 3 September 2019
The sensitivity of sorghum to pre-flowering cold stress, resulting in reduced pollen viability and poor seed set, is a major constraint for expanding growing areas into higher altitudes and latitudes. Nevertheless, compared to juvenile cold tolerance, reproductive cold tolerance in sorghum has received much less attention so far, and very little is known about its inheritance in F1-hybrids. We have composed a representative factorial (n = 49 experimental F1-hybrids) for a comprehensive study on heterosis and combining ability for crucial tolerance traits as spikelet fertility (panicle harvest index), seed yield and pollen viability, using field trials in stress- and control environments in Germany and Mexico as well as climate chamber experiments. Our results indicate a heterotic and rather dominant inheritance of reproductive cold tolerance in sorghum, with strong effects of female general combining ability (GCA) on F1-hybrid performance in our material. These findings, together with the comparatively low contribution of specific combining ability (SCA) effects and high heritability estimates, suggest that robust and efficient enhancement of reproductive cold tolerance is feasible via hybrid breeding. View Full-Text
Keywords: reproductive cold tolerance; sorghum hybrid breeding; combining ability; heterosis; pollen fertility; spikelet fertility; panicle harvest index reproductive cold tolerance; sorghum hybrid breeding; combining ability; heterosis; pollen fertility; spikelet fertility; panicle harvest index
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MDPI and ACS Style

Schaffasz, A.; Windpassinger, S.; Snowdon, R.; Wittkop, B. Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait. Agronomy 2019, 9, 508. https://doi.org/10.3390/agronomy9090508

AMA Style

Schaffasz A, Windpassinger S, Snowdon R, Wittkop B. Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait. Agronomy. 2019; 9(9):508. https://doi.org/10.3390/agronomy9090508

Chicago/Turabian Style

Schaffasz, André, Steffen Windpassinger, Rod Snowdon, and Benjamin Wittkop. 2019. "Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait" Agronomy 9, no. 9: 508. https://doi.org/10.3390/agronomy9090508

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