Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore

A considerable extent of interspecific hybridization among dominant canopy dipterocarp species was recently found in a tropical rain forest fragment in Singapore. However, information about the fertility of the hybrids and the growth of their successive hybrids remains limited. We studied the flower...

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Main Authors: Kenzo, Tanaka, Kamiya, Koichi, Ngo, Kang Min, Faizu, Nik, Lum, Shawn Kaihekulani Yamauchi, Igarashi, Shuichi, Norichika, Yuki, Ichie, Tomoaki
Other Authors: Asian School of the Environment
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143896
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1438962023-02-28T16:39:59Z Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore Kenzo, Tanaka Kamiya, Koichi Ngo, Kang Min Faizu, Nik Lum, Shawn Kaihekulani Yamauchi Igarashi, Shuichi Norichika, Yuki Ichie, Tomoaki Asian School of the Environment Science::Biological sciences Backcross Dipterocarp A considerable extent of interspecific hybridization among dominant canopy dipterocarp species was recently found in a tropical rain forest fragment in Singapore. However, information about the fertility of the hybrids and the growth of their successive hybrids remains limited. We studied the flowering phenology of four dipterocarp species in the genus Shorea (S. curtisii, S. leprosula, S. parvifolia, and S. macroptera) and two hybrids (S. curtisii × S. leprosula and S. leprosula × S. parvifolia) and studied the performances of seedlings reproduced from them. We observed that S. macroptera bloomed first, without overlap with congeneric species, followed by the other Shorea species and the two first filial (F1) hybrids. S. curtisii and S. leprosula, the species forming hybrids are most likely to succeed in this forest, completely overlapped with their hybrids. Fruits collected from the hybrids were viable, and these hybrid seedlings showed greater survival and a higher growth rate than those from pure species under greenhouse conditions. They included various cross types such as a backcross with each parent species. These results may imply that successive hybrids and introgression spontaneously occur among Shorea species. It may be important to consider the risk of hybridization for the management of tropical forests, particularly in degraded tropical rainforests where mechanisms of ecological isolation between closely related species might be altered. Accepted version 2020-09-30T03:06:11Z 2020-09-30T03:06:11Z 2019 Journal Article Kenzo, T., Kamiya, K., Ngo, K. M., Faizu, N., Lum, S. K. Y., Igarashi, S., . . . Ichie, T. (2019). Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore. Forest Ecology and Management, 435, 38–44. doi:10.1016/j.foreco.2018.12.038 0378-1127 https://hdl.handle.net/10356/143896 10.1016/j.foreco.2018.12.038 435 38 44 en Forest Ecology and Management © 2018 Elsevier B.V. All rights reserved. This paper was published in Forest Ecology and Management and is made available with permission of Elsevier B.V. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Biological sciences
Backcross
Dipterocarp
spellingShingle Science::Biological sciences
Backcross
Dipterocarp
Kenzo, Tanaka
Kamiya, Koichi
Ngo, Kang Min
Faizu, Nik
Lum, Shawn Kaihekulani Yamauchi
Igarashi, Shuichi
Norichika, Yuki
Ichie, Tomoaki
Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore
description A considerable extent of interspecific hybridization among dominant canopy dipterocarp species was recently found in a tropical rain forest fragment in Singapore. However, information about the fertility of the hybrids and the growth of their successive hybrids remains limited. We studied the flowering phenology of four dipterocarp species in the genus Shorea (S. curtisii, S. leprosula, S. parvifolia, and S. macroptera) and two hybrids (S. curtisii × S. leprosula and S. leprosula × S. parvifolia) and studied the performances of seedlings reproduced from them. We observed that S. macroptera bloomed first, without overlap with congeneric species, followed by the other Shorea species and the two first filial (F1) hybrids. S. curtisii and S. leprosula, the species forming hybrids are most likely to succeed in this forest, completely overlapped with their hybrids. Fruits collected from the hybrids were viable, and these hybrid seedlings showed greater survival and a higher growth rate than those from pure species under greenhouse conditions. They included various cross types such as a backcross with each parent species. These results may imply that successive hybrids and introgression spontaneously occur among Shorea species. It may be important to consider the risk of hybridization for the management of tropical forests, particularly in degraded tropical rainforests where mechanisms of ecological isolation between closely related species might be altered.
author2 Asian School of the Environment
author_facet Asian School of the Environment
Kenzo, Tanaka
Kamiya, Koichi
Ngo, Kang Min
Faizu, Nik
Lum, Shawn Kaihekulani Yamauchi
Igarashi, Shuichi
Norichika, Yuki
Ichie, Tomoaki
format Article
author Kenzo, Tanaka
Kamiya, Koichi
Ngo, Kang Min
Faizu, Nik
Lum, Shawn Kaihekulani Yamauchi
Igarashi, Shuichi
Norichika, Yuki
Ichie, Tomoaki
author_sort Kenzo, Tanaka
title Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore
title_short Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore
title_full Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore
title_fullStr Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore
title_full_unstemmed Overlapping flowering periods among Shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of Singapore
title_sort overlapping flowering periods among shorea species and high growth performance of hybrid seedlings promote hybridization and introgression in a tropical rainforest of singapore
publishDate 2020
url https://hdl.handle.net/10356/143896
_version_ 1759853932371247104