Sains Malaysiana 43(2)(2014): 161–168
Growth
Performance, Sexual Reproduction and Clonal Propagation of Iris japonica
Thunb.
Natural Populations in Contrast Reciprocal Habitats on Jinyun Mountain, China
(Prestasi Pertumbuhan, Pembiakan Seks dan Perambatan Klon bagi
Populasi Semula Jadi Iris japonica
Thunb. dalam Habitat Resiprokal
Bertentangan di Gunung Jinyun, China)
QING-YU
LI1,
JIAN-PING TAO2,
ZHANG-CHENG ZHONG2&
YONG-JIAN WANG*1
21College of Horticulture & Forestry Sciences, Huazhong Agricultural
University
Wuhan 430070, China
2Key Laboratory of Eco-environments of Three Gorges, Reservoir
Region
(Ministry of Education), School of Life Sciences, Southwest
University
Chongqing 400715, China
Diserahkan: 16 Januari 2013/Diterima: 18 Mei 2013
ABSTRACT
Growth performance, sexual reproduction and clonal propagation of I. japonica population in contrast reciprocal
habitats; Open Area of Forest Edge (OAFE) and Bamboo Forest (BF)
on Jinyun Mountain were studied to understand the adaptability of growth and
reproductive of I. japonica in different
habitats. The results were as follows: quantitative characteristics of growth
and clonal propagation of I. japonica at genet (a group of genetically
identical individuals, consists of whole ramets) level and at ramet (a unit
composed of a shoot and root, with independent morphological and physiological
traits in the same genet) level were higher in BF.
However, quantitative characteristics of sexual reproduction at genet and ramet
level were higher in OAFE. Biomass and allocation also
showed the same trend as quantitative characteristics. Reproductive components
(at ramet level) were significantly different and had trade-off in contrast
reciprocal habitats. Allocation to clonal propagation and sexual reproduction
of mother ramet was significantly negative correlation with allocation to
daughter ramet (especially in BF). There was a trade-off
between reproduction components (allocation to sexual reproduction and clonal
propagation of mother ramet) in OAFE. Therefore, it showed
predominantly sexual reproduction in OAFE and clonal propagation in BF.
The results indicated that the contrast environmental stress shaping growth
performance and reproduction variation of I. japonica in genet and ramet
level in contrasting habitats might pronounce adaptive population
differentiation among forest habitats.
Keywords: Contrast reciprocal habitat; genet; reproductive
allocation; trade-off
ABSTRAK
Prestasi pertumbuhan, pembiakan seks dan perambatan klon bagi populasi I. japonica dalam habitat
resiprokal bertentangan; Kawasan Pinggiran Hutan Terdedah (OAFE)
dan Hutan Buluh (BF) di Gunung Jinyun telah dikaji
untuk memahami keupayaan beradaptasi pertumbuhan dan pembiakan I. japonica dalam
habitat yang berbeza. Keputusan adalah seperti berikut: ciri kuantitatif
pertumbuhan dan perambatan klon
bagi I. japonica pada peringkat genet (sekumpulan individu mempunyai
genetik seiras yang terdiri daripada keseluruhan ramet) dan ramet (satu unit
terdiri daripada pucuk dan akar dengan ciri morfologi dan fisiologi yang bebas
dalam genet yang sama) adalah lebih tinggi dalam BF.
Biojisim dan peruntukan juga menunjukkan corak yang sama seperti ciri kuantitatif. Komponen pembiakan (pada peringkat
ramet) berbeza secara signifikan dan menunjukkan pampasan dalam habitat
resiprokal bertentangan. Peruntukan kepada perambatan klon dan pembiakan seks
bagi ramet induk betina menunjukkan korelasi negatif secara signifikan dengan
peruntukan terhadap ramet anak (terutamanya dalam BF). Pampasan diperhatikan antara komponen pembiakan (peruntukan
terhadap pembiakan seks dan perambatan klon bagi ramet induk betina) dalam OAFE. Oleh itu, pembiakan seks ditunjukkan secara dominan dalam OAFE dan perambatan klon dalam BF. Keputusan kami menunjukkan tekanan persekitaran bertentangan yang membentuk
pretasi pertumbuhan dan variasi pembiakan I. japonica pada peringkat
genet dan ramet dalam habitat bertentangan mungkin membawa kepada pembezaan
populasi adaptif antara habitat hutan.
Kata kunci: Genet; habitat resiprokal
bertentangan; pampasan; peruntukan pembiakan
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*Pengarang
untuk surat-menyurat; email: wangyj@mail.hzau.edu.cn
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