Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait
| Autor: | Benjamin Wittkop, André Schaffasz, Steffen Windpassinger, Rod J. Snowdon |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Heterosis Biology medicine.disease_cause 01 natural sciences spikelet fertility lcsh:Agriculture Pollen medicine heterosis Juvenile combining ability Panicle Hybrid pollen fertility lcsh:S food and beverages 04 agricultural and veterinary sciences Heritability Sorghum biology.organism_classification Agronomy 040103 agronomy & agriculture Trait sorghum hybrid breeding 0401 agriculture forestry and fisheries reproductive cold tolerance Agronomy and Crop Science panicle harvest index 010606 plant biology & botany |
| Zdroj: | Agronomy, Vol 9, Iss 9, p 508 (2019) Agronomy Volume 9 Issue 9 |
| ISSN: | 2073-4395 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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