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Challenges for ex situ conservation of wild bananas: seeds collected in Papua New Guinea have variable levels of desiccation tolerance

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Title Challenges for ex situ conservation of wild bananas: seeds collected in Papua New Guinea have variable levels of desiccation tolerance
 
Creator Kallow, Simon
Longin, Kevin
Fanega Sleziak, Natalia
Janssens, Steven B.
Vandelook, Filip
Dickie, John
Swennen, Rony L.
Paofa, Janet
Carpentier, Sebastien C.
Panis, Bartholomeus
 
Subject banana
crop wild relatives
ex-situ conservation
drying
plant genetic resources
seed storage
banano
especies silvestres afín a las plantas cultivadas
conservación ex-situ
secado
 
Description Ex situ seed conservation of banana crop wild relatives (Musa spp. L.), is constrained by critical knowledge gaps in their storage and germination behaviour. Additionally, challenges in collecting seeds from wild populations impact the quality of seed collections. It is, therefore, crucial to evaluate the viability of seeds from such collecting missions in order to improve the value
of future seed collections. We evaluate the seed viability of 37 accessions of seven Musa species, collected from wild populations in Papua New Guinea, during two collecting missions. Seeds from one mission had already been stored in conventional storage (dried for four months at 15% relative humidity, 20 ◦C and stored for two months at 15% relative humdity, −20 ◦C), so a post-storage test was carried out. Seeds from the second mission were assessed freshly extracted and following desiccation.
We used embryo rescue techniques to overcome the barrier of germinating in vivo Musa seeds. Seeds from the first mission had low viability (19 ± 27% mean and standard deviation) after storage for two months at 15% relative humidity and −20 ◦C. Musa balbisiana Colla seeds had significantly higher post-storage germination than other species (p < 0.01). Desiccation reduced germination of the seeds from the second collecting mission, from 84 ± 22% (at 16.7 ± 2.4% moisture content) to 36 ± 30% (at 2.4 ± 0.8% moisture content). There was considerable variation between and (to a lesser extent) within accessions, a proportion of individual seeds of all but one species (Musa ingens N.W.Simmonds) survived desiccation and sub-zero temperature storage. We identified that seeds from the basal end of the infructescence were less likely to be viable after storage (p < 0.001); and made
morphological observations that identify seeds and infructescences with higher viability in relation to their developmental maturity. We highlight the need for research into seed eco-physiology of crop wild relatives in order to improve future collecting missions.
 
Date 2020-10
2020-10-22T14:41:43Z
2020-10-22T14:41:43Z
 
Type Journal Article
 
Identifier Kallow, S.; Longin, K.; Fanega Sleziak, N.; Janssens, S.B.; Vandelook, F.; Dickie, J.; Swennen, R.; Paofa, J.; Carpentier, S.; Panis, B. (2020) Challenges for ex situ conservation of wild bananas: seeds collected in Papua New Guinea have variable levels of desiccation tolerance. Plants 9(9) 1243 ISSN: 2223-7747
2223-7747
https://hdl.handle.net/10568/109939
https://doi.org/10.3390/plants9091243
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format application/pdf
 
Publisher MDPI AG
 
Source Plants