The use of seedling root and shoot traits to predict the saleable yield of elite red papaya genotypes

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Ali, F
Ford, R
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2024
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Abstract

Determining the saleable fruit yield of red hermaphrodite papaya (Carica papaya L.) relies on waiting until tree maturity. Recombinant inbred lines (RIL) seedlings (F6-F7 RIL) were assessed for fresh root length, fresh shoot weight, fresh shoot width, dry root weight and dry shoot weight during three growth stages after sowing (0-30 days after sowing; DAS, 31–60 DAS and 61–90 DAS). During the 31–60 DAS period, significant intra-genotypic variation was observed for each trait across the RIL assessed. A strong genotypic correlation at growth stage II was predicted among the traits (P < 0.05; rg > 0.60), with a moderate to high broad-sense heritability (H2b.s; > 0.30) and with genetic advances of up to 10% in the RIL compared to the parental genotypes. Growth stage II was most reliable for predicting saleable fruit yield (R2 = 0.73) with levels of influence of traits measured across the RIL in the following order: fresh root length (40% to 70%) > dry root weight (20% to 50%) > dry shoot weight (10% to 48%) > fresh shoot width (13% to 38%) > fresh shoot weight (1% to 42%). Hence, these F7 genotypes will be used to develop new F1 hybrids with significant increases in saleable fruit yield.

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New Zealand Journal of Crop and Horticultural Science

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© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.

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This publication has been entered in Griffith Research Online as an advance online version.

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Agricultural biotechnology

Crop and pasture production

Horticultural production

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Ali, F; Ford, R, The use of seedling root and shoot traits to predict the saleable yield of elite red papaya genotypes, New Zealand Journal of Crop and Horticultural Science, 2024

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