Acta Botanica Sinica

Soil erosion and nutrient loss due to erosion are world-wide problems. Similar to soil loss by erosion, soil nitrogen (N) loss by erosion in small catchments is affected by vegetation coverage. The practice of comprehensive management for catchments mainly by adjusting cropland, grassland and woodland areas was widely adopted to reduce soil and water loss in catchments of the Chinese Loess Plateau. Three experiments under natural and artificial rainfall conditions on N loss by erosion for a model catchment and for an actual catchment in Zhifanggou of Ansai County in China was performed to determine the relationships between comprehensive management and N loss by runoff in small catchments. The results for vegetation coverage of 60%, 40%, 20% and 0 show that runoff loss of ammonium, nitrate, and total N were 87.08, 44.31, 25.16, 13.71 kg/km(2); 85.50, 74.06, 63.95, 56.23 kg/km(2); and 0.18, 1.18, 1.98, 7.51 t/ km(2), respectively. Due to reduction in the size of cropped area on steeply sloping land, soil N loss by erosion in the catchments was decreased by 15.8% as compared with that in 1992, i.e., from 8 758.5 kg in 1992 to 7 562.2 kg in 1998. Whereas, catchments act as a filter for ammonium and nitrate in rain, the catchment filtering effects on nitrate is remarkably higher than that on ammonium. The enrichment of < 20 mum aggregate in sediment results in the enrichment of organic matter and total N in flood sediment. Greater vegetation coverage can effectively decrease soil erosion and total N loss. However, soil mineral N loss increased as vegetation coverage increased.

Xingchang Zhang

Mingan Shao

Zhiwu xuebao

Effects of vegetation coverage and management practice on soil nitrogen loss by erosion in a hilly region of the Loess Plateau in China

植被覆盖与管理措施对黄土高原丘陵区土壤氮素流失的影响

Three new ent-kaurene diterpenoids, adenanthins N, 0 and P (1-3), and four known diterpenoids, leucophyllin E (4), glabcensin C (5), adenanthin A (6), leucophyllin B (7), together with a highly unsaturated fatty acid, 9,16-dioxo-10,1 2,14-octadeca-trienoic acid (8), were isolated from Isodon adenanthus (Diels) Kudo. The structure of compound 4 was revised accordingly. Compound I showed significant cytotoxic activity against K562 cells with IC50 = 0.45 mug/mL.

W Xiang

QB Han

SH Li

Z Na

HD Sun

ent-kaurene diterpenoids from Isodon adenanthus

来自腺花香茶菜的ent-贝壳杉烯二萜类化合物

The breeding system of an endangered dioecious species, Woonyoungia septentrionalis (Dandy) Law, was studied in two natural populations, the Mulun population and the Dahuangni population, in Guangxi Province, China from June 2001 to early September 2002. The female flowers from previously bagged buds were treated respectively with paper bags, net bags and hand pollination by comparing with natural pollination. The results showed that female flowers treated with paper bags, net bags, hand pollination, and natural pollination all set fruits and seeds, but there was great difference in their fruit set, seed set, pre-emergent reproductive success (PERS) and seed germination rate for two populations. In both populations, PERS of hand pollination and natural pollination were higher than those of paper bagged and net bagged treatments. Among them, PERS of hand pollination was the highest, and PERS of net bagged treatment was the lowest. Both sexual reproduction and apomixis occurred simultaneously in W septentrionalis and seeds from both sexual and apomixis could germinate into seedlings. Therefore, the breeding system of W septentrionalis belonged to facultative apomixis. The apomixis in Magnoliaceae was reported for the first time.

Qingwen Zeng

Dianxiang Zhang

Zezheng Gao

Fuwu Xing

Facultative apomixis in an endangered dioecious species, Woonyoungia septentrionalis (Magnoliaceae)

濒危雌雄异株植物天女花（木兰科）中的兼性无融合生殖

These changes showed that state transition and xanthophyll cycle caused a decrease of Fs in apple leaf at light levels below and above the photosynthetic saturation irradiance, respectively. When apple leaf was pre-treated with NEM, the PS II apparent rate of photochemical reaction (P-rate) and photochemical quenching (qP) decreased significantly in the light range of 600-800 #mu#mol·m~(-2)·s~(-1), but the non-photochemical quenching (qN) existed a small increase at 600-800#mu#mol·m~(-2)·s~(-1) and a decrease above 800#mu#mol·m~(-2)·s~(-1). These phenomena suggested that state transition was mainly a photochemical and a non-photochemical process in apple leaf responding to light lower and higher than photosynthetic saturatio irradiance, respectively.

Jia Hu-Sen

LI De-Quan

State transition, is it a photochemical or non-photochemical process in leaf in response to irradiance?

光照下叶片状态转变：是光化学过程还是非光化学过程？

Geng De-Gui

Han Yan

Wang Yi-Qin

Wang Peng

Zhang Li-Ming

LI Wen-Bin

Sun Yong-Ru

Construction of a system for the stable expression of foreign genes in Dunaliella salina

构建杜氏盐藻中外源基因稳定表达系统

Lin Li

Tian Shi-Ping

Wan Ya-Kun

Xu Yong

Yao Hong-Jie

Effects of Temperature and Atmosphere Component on Quality of Stored Jujube Fruit

温度和大气成分对贮藏枣果品质的影响

This suggested that TaRAN1 plays a role in mitotic spindle assembly and microtubule integrity and stability. Ultrastructural analysis under transmission electron microscope (TEM) showed abnormal nuclear membranes in the overexpression TaRAN1 yeast cells, abnormal vacuole structures and disorganized membranes in the antisense TaRAN1 yeast cells. These results suggested that TaRAN1 was essential for all nucleocytoplasmic transport events.

Xin Wang

Ye Han

Chang Bin Chen

Kang Chong

Zhi Hong Xu

Wheat RAN1 affects microtubules integrity and nucleocytoplasmic transport in fission yeast system

小麦RAN1影响微管完整性和裂殖酵母系统中的核质运输

出版信息	出版商: Kexue Chubaneshe/Science Press，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 1979，原创研究文献占比: ，自引率:， Gold OA占比:

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Effects of vegetation coverage and management practice on soil nitrogen loss by erosion in a hilly region of the Loess Plateau in China

ent-kaurene diterpenoids from Isodon adenanthus

Facultative apomixis in an endangered dioecious species, Woonyoungia septentrionalis (Magnoliaceae)

State transition, is it a photochemical or non-photochemical process in leaf in response to irradiance?

Construction of a system for the stable expression of foreign genes in Dunaliella salina

Effects of Temperature and Atmosphere Component on Quality of Stored Jujube Fruit

Wheat RAN1 affects microtubules integrity and nucleocytoplasmic transport in fission yeast system

Wheat RAN1 affects microtubules integrity and nucleocytoplasmic transport in fission yeast system

Effects of Temperature and Atmosphere Component on Quality of Stored Jujube Fruit

Effects of Temperature and Atmosphere Component on Quality of Stored Jujube Fruit