Somatic embryo is widely used in genetic engineering and cell engineering. This paper reviewed the recent research results of somatic embryogenesis in Cucurbitaceae plants. Somatic embryogenesis is controlled by many ...Somatic embryo is widely used in genetic engineering and cell engineering. This paper reviewed the recent research results of somatic embryogenesis in Cucurbitaceae plants. Somatic embryogenesis is controlled by many factors such as genotype, explant type, seedling age, basal culture medium, carbohydrate, nitrogen, growth regulators, additives and illumination et al.. Abnormality, desynchrony and browning are the main problem existing in Cucurbitaceae somatic embryogenesis. Then some ideas on how to obtain high quality somatic embryo are given. At last, we forecast the application of somatic embryo in breeding of Cucurbitaceae plants.展开更多
Lowland tropical forest in Peninsular Malaysia consist a valuable dipterocarp timber species. In fact, dipterocarp tree species growth well when the ecology is maintained and their growth are dependent on the micro cl...Lowland tropical forest in Peninsular Malaysia consist a valuable dipterocarp timber species. In fact, dipterocarp tree species growth well when the ecology is maintained and their growth are dependent on the micro climate and also affected by lithology types. This study was carried out to identify and map tree species dominancy by lithology types at Hulu Sedili Forest Reserve （HSFR） using Geographic Information System （GIS） technique. Different lithology type maps were derived namely Igneous, Sedimentary and Limestone. Through GIS operations tree species data collected from pre-felling inventory and ground survey were overlaid with lithology features. Results showed that at Sedimentary and Igneous types, the presence of dipterocarpaceae family is only 3.09%, and non-dipterocarpaceae family was 96.91%. Syzygium spp. （19.83%） was the most abundance in Igneous and Sedimentary. Meanwhile, Elateriospermum tapos （9.92%） and Lauraceae＇s family （7.22%） were found to be the most dominant species in Sedimentary types, Macaranga spp. （11.21%） and Elateriospermum tapos （11.02%） in igneous types. However, a Limestone type was discarded from analysis due to unavailable pre-felling data. Thus, this study indicated that there was variation in species dominancy of different lithology types. On the other hand, GIS demonstrated its capability as a useful tool in identifying and maps the location of trees species based on lithology types.展开更多
文摘Somatic embryo is widely used in genetic engineering and cell engineering. This paper reviewed the recent research results of somatic embryogenesis in Cucurbitaceae plants. Somatic embryogenesis is controlled by many factors such as genotype, explant type, seedling age, basal culture medium, carbohydrate, nitrogen, growth regulators, additives and illumination et al.. Abnormality, desynchrony and browning are the main problem existing in Cucurbitaceae somatic embryogenesis. Then some ideas on how to obtain high quality somatic embryo are given. At last, we forecast the application of somatic embryo in breeding of Cucurbitaceae plants.
文摘Lowland tropical forest in Peninsular Malaysia consist a valuable dipterocarp timber species. In fact, dipterocarp tree species growth well when the ecology is maintained and their growth are dependent on the micro climate and also affected by lithology types. This study was carried out to identify and map tree species dominancy by lithology types at Hulu Sedili Forest Reserve （HSFR） using Geographic Information System （GIS） technique. Different lithology type maps were derived namely Igneous, Sedimentary and Limestone. Through GIS operations tree species data collected from pre-felling inventory and ground survey were overlaid with lithology features. Results showed that at Sedimentary and Igneous types, the presence of dipterocarpaceae family is only 3.09%, and non-dipterocarpaceae family was 96.91%. Syzygium spp. （19.83%） was the most abundance in Igneous and Sedimentary. Meanwhile, Elateriospermum tapos （9.92%） and Lauraceae＇s family （7.22%） were found to be the most dominant species in Sedimentary types, Macaranga spp. （11.21%） and Elateriospermum tapos （11.02%） in igneous types. However, a Limestone type was discarded from analysis due to unavailable pre-felling data. Thus, this study indicated that there was variation in species dominancy of different lithology types. On the other hand, GIS demonstrated its capability as a useful tool in identifying and maps the location of trees species based on lithology types.
