Taburan dan biologi spesies tumbuhan akuatik endemik daripada genus cryptocoryne dl Semenanjung Malaysia

Loading...
Thumbnail Image
Date
1998-05
Authors
Cheng Hua, Sim
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
From the ecological survey conducted throughout Peninsular Malaysia, ten ยท species of Cryptocoryne were recorded from 25 sites. The ten species were C. affinis, C. cordata, C. griffithii, C. minima, C. elliptica, C. nurii, C. schu/zei, C. purpurea, C. Ciliata and C. /ongicauda. Out of the these species, only six species were easily harvested and studied intensively, particularly on the ecological, morphological, physiological, culture and growth aspects. The distribution of Cryptocoryne species is generally restricted to one locality, except for C. affinis which is widely distributed in small rivers on the eastern part of the Main Range. The results showed that C. minima and C. e/liptica grew well under white, red and blue lights, however, the growth was inhibited under green light. All the Cryptocoryne species thrived well under photoperiod 16 L, therefore these species survived under shaded conditions in their natural habitats and occasionally grew well under the canopy of big trees. Comparatively, Cryptocoryne was recorded to grow well in Hoagland nutrient solution rather than Knop nutrient solution, However, the growth was considerably inhibited by the nutrient solution deficient in N, P, K, Ca and Fe. Addition of 0.01 g/1 Giberellic acid hormone to nutrient solutions accelerated the growth rate. Evidently, Cryptocoryne was able to utilise bicarbonate ion (HC03-) from bicarbonate water (KHC03) which acted as a carbon source during the process of photosynthesis. Apparently, the water levels could affect the growth rate and C. elliptica was recorded to achieve higher growth rate in semi submerged condition, whereas C. minima dan C. schulzei grew well in submerged condition. In addition, substrates also played a major role in enhancing the growth of these species. Cryptocoryne minima grew well in peat soil from natural habitat. The seed germination rate for C. minima was recorded to achieve 1 00 % in peat soil. Cryptocoryne e/liptica was noted to produce adventitious plantlet at the base of the petiole. Only the life cycle of C. minima which took about 360 days was established, however, life-cycle for the rest of the species studied were relatively difficult to obtain. One of the most important reasons is that the seeds from most of these endemic species are difficult to obtain either naturally or from the cultured species in the laboratory.
Description
Keywords
Biologi spesies tumbuhan , Akuatik endemik , Semenanjung Malaysia , Genus cryptocoryne
Citation