Abstract
Flowering is one of the most critical determinants of nut tree crop yield and flower sex types that are predictive of high yields are needed to enhance the effectiveness of cashew varietal development. Under tropical and subtropical climates, cashew flowering coincides with the annual drought and could be affected by high moisture and temperature stress. The genotype × environment interaction effects on flower sex type expression of cashew has never been explored. Our current study employed a multi-environment trial established in two contrasting agro-ecological zones to elucidate the effects of genotype and environment on male, hermaphrodite and sterile flower sex type expression. Our results showed that most of the variability found were largely due to environmental influence (˃80%) and hermaphrodite and sterile flower sex types were the most sensitive. Male, hermaphrodite and sterile flower numbers ranged from 61.6–107.1, 5.6–38.7 and 1.5–14.4 per panicle respectively. The GGE Biplot model employed to analyze the interaction showed that clones SG004, SB9 and KT1 were stable for all the flower sex types. Clones that gave high number of male and hermaphrodite flowers had higher yields in suboptimal environments whereas in near optimal environments, clones that gave low number of sterile flowers had high yields. While our study highlights the benefit of employing a multi-environment trial to identify cashew clones with superior flowering characteristics to face future variability of environmental conditions attributed to global warming, the effectiveness of cashew flower sex type in predicting nut yield could vary with prevailing environmental conditions.
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All data generated or analysed during this study are included in this published article.
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Acknowledgements
The authors thank the field staff of Bole and Wenchi Agricultural Research Station for their support and assistance throughout this study. This manuscript is published with the kind permission of the Executive Director of Cocoa Research Institute of Ghana (CRIG) as manuscript number CRIG/02/2022/035/007.
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The authors acknowledge the support of the Deutsche Gesellschaft für Internationale Zusammenarbeit GmbH (GIZ) with funding through Commcashew and the Cocoa Research Institute of Ghana (CRIG).
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PKKAG and FKP conceived and designed the experiment. PKKAG and MTB performed the experiment, collected and analyzed data and wrote the manuscript. AA, AMD and SOA all assisted with data collection and provided significant editorial and analytical advice.
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Adu-Gyamfi, P.K.K., Akpertey, A., Barnor, M.T. et al. Genotype × Environment Interaction Effects on Cashew (Anacardium occidentale L.) Flower Sex Type Expression. Tropical Plant Biol. 15, 157–170 (2022). https://doi.org/10.1007/s12042-022-09310-0
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DOI: https://doi.org/10.1007/s12042-022-09310-0