Southern highland papaya (Vasconcellea quercifolia A. St.-Hil.): Do fruit ripening and harvesting time affect seed germination?

Urtasun, María Manuela; Giamminola, Eugenia Mabel; Viana, Marta Leonor de

doi:10.4025/actasciagron.v42i1.42825

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…Although the Caricaceae is an economically important plant family, there are very few published reports of the germination requirements and desiccation tolerance among its species, and most studies have focused on C. papaya. Nonetheless, the available information shows that seeds within this plant family exhibit various types of dormancy and that the low seed germination rate is caused by inhibitory substances found in both the sarcotesta (the gel-like coating around the seeds) and the sclerotesta (the tough central layer of the testa) [8, 9,14]. However, most species in the family possess seeds with PD [3].…”

Section: Introductionmentioning

confidence: 99%

Dormancy-breaking and germination requirements for seeds of the threatened Austral papaya (Carica chilensis)

Loayza,

García-Guzmán,

Carozzi-Figueroa

et al. 2023

Preprint

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Seed dormancy is one of the most important adaptive mechanisms in plants, which optimizes germination, seedling emergence, and establishment so that these processes occur when environmental conditions are favorable for plant survival and growth. Endemic to rocky environments of the southern Atacama Desert, the Austral papaya (Carica chilensis) is the papaya species with the southernmost distribution of the Caricaceae and the species growing in the most extreme environmental conditions. This threatened plant has minimal natural regeneration, attributed to low germination rates, but no information regarding seed dormancy release exists. Here we investigated the dormancy-breaking requirements and germination of C. chilensis by assessing the combined effects of desiccation with nine pre-sowing treatments. We hypothesized that, as in other members of the family, C. chilensis seeds would possess physiological dormancy. Our results confirmed this hypothesis and revealed that ultra-drying (< 3% moisture content) and treating seeds with sulfuric acid, gibberellic acid, or potassium nitrate are the most effective methods for germinating C. chilensis. These treatments are thus recommended to propagate this threatened papaya species.

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Section: Introductionmentioning

confidence: 99%

Dormancy-breaking and germination requirements for seeds of the threatened Austral papaya (Carica chilensis)

Loayza,

García-Guzmán,

Carozzi-Figueroa

et al. 2023

Preprint

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Germplasm variation among wild populations of the Argentinean highland papayas (Vasconcellea quercifolia A.St.-Hil. and V. glandulosa A.DC.): implications for conservation

Urtasun

Lamas

Cornejo

et al. 2023

Genet Resour Crop Evol

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Species of Vasconcellea are promising for the agricultural industry as a source of genes for papaya improvement because many of them have edible fruits with favorable organoleptic properties. Vasconcellea quercifolia and V. glandulosa are the southernmost species and have recently been categorized as species of high conservation priority in Argentina. Although seeds of both species can be stored in genebanks, no speci c studies have been conducted on their germplasm variation, which is a key aspect to designing a conservation strategy. In this work, we assess morphological, physiological, and biochemical variability at the species and population levels and propose a conservation strategy. In four wild populations of each species located at different elevations in northwest Argentina, vegetative and reproductive material was collected from 110 individuals of V. glandulosa and 70 of V. quercifolia. Twenty-seven morphological, two biochemical and four physiological descriptors were determined to characterize each species. Then, variance decomposition, differences between populations (with ANOVA) and a principal component analysis were performed using morphological quantitative fruit and seed data, to assess variability between populations. Although both species showed a wide range of phenotypic variability, it was higher in V. quercifolia than in V. glandulosa and within each population than between them. Leaves, female owers and physiological descriptors were the most variable, while seed morphological descriptors were the least variable. Variance analysis revealed differences between populations in the majority of morphological descriptors. We recommend collecting germplasm from the entire natural distribution range of each species and from many individuals in each population.

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Dormancy release, germination and ex situ conservation of the southern highland papaya (Vasconcellea quercifolia, Caricaceae), a wild crop relative

Urtasun

Giamminola

Baskin

et al. 2020

Scientia Horticulturae

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Southern highland papaya (Vasconcellea quercifolia A. St.-Hil.): Do fruit ripening and harvesting time affect seed germination?

Cited by 4 publications

References 2 publications

Dormancy-breaking and germination requirements for seeds of the threatened Austral papaya (Carica chilensis)

Dormancy-breaking and germination requirements for seeds of the threatened Austral papaya (Carica chilensis)

Germplasm variation among wild populations of the Argentinean highland papayas (Vasconcellea quercifolia A.St.-Hil. and V. glandulosa A.DC.): implications for conservation

Dormancy release, germination and ex situ conservation of the southern highland papaya (Vasconcellea quercifolia, Caricaceae), a wild crop relative

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