摘要：
以2年生闽楠幼苗为材料,探讨不同遮荫处理[0(CK,全光照)和30%、50%、70%遮荫]对闽楠[ Phoebe bournei (Hemsl.) Yang]幼苗光合作用及其叶片解剖结构的影响,为闽楠的合理栽培及人工林混交树种的配置提供理论依据。结果表明:(1)与全光照处理(CK)相比,闽楠幼苗叶片净光合速率( P n)、蒸腾速率( T r)、气孔导度( G s)、最大净光合速率( P nmax )、光饱和点(LSP)、光补偿点(LCP)及暗呼吸速率(Rd)均随遮荫强度的增加而显著下降;在30%和50%遮荫下,幼苗能通过提高水分利用效率(WUE)和表观量子效率(AQY),增加叶绿素含量来充分利用弱光环境;70%遮荫处理则影响闽楠幼苗的正常生长。(2)遮荫降低了闽楠幼苗叶片的气孔密度,但单个气孔器的面积显著增加;遮荫处理下,闽楠叶片和主脉明显变薄;栅栏组织和海绵组织厚度降低,排列稀疏,栅海比减小,有利于提高对光能的利用效率。(3)闽楠幼苗根、茎、叶及总生物量均在全光照下最大,遮荫抑制了植株生物量的积累。研究发现,闽楠幼苗在遮荫处理下生物量积累和光合效率降低,但同时在叶片解剖结构和功能上表现出对遮荫的适应性,从而表现出一定的耐荫性。
作者：
Liu, Q.;Arnold, R. J.;Yang, S. Z.;Wu, J. Y.;Li, Z. H.;...
期刊：
Australian Forestry,2019年82(3):139-150 ISSN：0004-9158
通讯作者：
Arnold, RJ
作者机构：
[Liu, Q.; Yang, S. Z.; Wu, J. Y.; Cheng, Y.] Hunan Acad Forestry, Precious Tree Species Res Inst, Changsha, Hunan, Peoples R China;[Liu, Q.; Li, Z. H.; Li, Y.] Cent South Univ Forestry & Technol, Coll Forestry, Changsha, Hunan, Peoples R China;[Arnold, R. J.] China Eucalypt Res Ctr, Zhanjiang, Guangdong, Peoples R China
通讯机构：
[Arnold, R. J.] C;China Eucalypt Res Ctr, Zhanjiang, Guangdong, Peoples R China.
摘要：
Toona ciliata is a tree species native to Oceania, Southeast Asia, China and to the Indian subcontinent that is favoured for production of very high value timber. In this study, the potential for exogenous application of polyamines (PAs) for improving the ability of young trees to tolerate drought stress was examined. Two-year-old seedling trees were treated with foliar sprays of three PAs (putrescine (Put), spermidine (Spd) and spermine (Spm)) in 1 mM solutions three times at intervals of one day and then exposed to drought stress by withholding of irrigation over a period of 21 days. The PA pre-treatments reduced water loss and improved membrane integrity, photosynthetic capacity, antioxidant systems and upregulation of the expression of S-adenosylmethionine decarboylase (SAMDC) gene of trees under drought stress, with Spd or Spm pre-treatments generally being superior to that of Put. The enhanced drought tolerance of young T. ciliata seedlings induced by PA pre-treatment was associated with enhanced photosynthetic capacity, and a reduction in the loss of water in association with altered anatomical structure of leaflets.
作者机构：
[王佩兰; 李志辉; 李金华; 胡淑蓉] Forestry College, Central South University of Forestry and Technology, Changsha, 410004, China;[刘球] Hunan Academy of Forestry, Changsha, 410004, China
通讯机构：
[Liu, Q.] H;Hunan Academy of Forestry, Changsha, China
会议名称：
International Conference on Medicine and Biopharmaceuticals (ICMB)
会议时间：
AUG 15-16, 2015
会议地点：
Guilin, PEOPLES R CHINA
会议主办单位：
[Ou, Ri-Ming;Niu, Fang-Hua;Yang, Yu-Jie;Li, Zhi-Hui] Cent South Univ Forestry & Technol, Dept Forestry, Changsha 410004, Hunan, Peoples R China.
摘要：
Sloanea hemsleyana, a member of Elaeocarpaceae, is an evergreen thrifty tree with straight trunk. The timber can be used for construction, furniture, etc. The setting percentage of Sloanea hemsleyana is relatively low and seeds storage is difficult. These problems with low emergence rate result in insufficient provenance, thus, how to produce plantlets efficiently becomes a big challenge in current forestry. Tissue culture as an asexual reproduction technique can help in producing large number of Sloanea hemsleyana plantlets with excellent features in a short period. In this study, we focused on explants selection and sterilization, basic medium selection, variety and concentration of hormone, induction, proliferation and differentiation of callus, multiple shoots and root induction. The results were as follows: (1) Explants sterilization: the best sterilization procedure for tender stem of 1-2a explants was 70% ethanol 15 s +0.1 % HgCl2 15 min. (2) Explants and basic medium selection for callus induction: axillary bud was the best explants for Sloanea hemsleyana callus induction; MS medium was the best basic medium. (3) Proliferation and differentiation of callus: the best proliferation medium was MS+1.0 mg/L 6-BA+0.3 mg/L IBA; the best differentiation medium was MS+1.5 mg/L 6-BA+0.1 mg/L IBA. (4) Multiple shoots and root induction: the best medium for multiple shoot induction from terminal bud was 1/2MS+1.5mg/L 6-BA+0.01 mg/L IBA+0.1 mg/L TDZ; the best basic medium for multiple shoot induction was 1/2 MS+1.5mg/L 6-BA+0.1mg/L TDZ; the best medium for inducing root from callus was 1/4 MS+1mg/L 6-BA+1mg/L IBA.
作者机构：
[李艳; 李志辉] Forestry College, Central South University of Forestry and Technology, Changsha, 410004, China;[杨硕知; 吴际友] Hunan Academy of Forestry, Changsha, 410004, China;China Eucalypt Research Centre, Zhanjiang, Guangdong 524022, China;[吴志华] China Eucalypt Research Centre, Zhanjiang, Guangdong 524022, China;[刘球] Forestry College, Central South University of Forestry and Technology, Changsha, 410004, China, Hunan Academy of Forestry, Changsha, 410004, China
通讯机构：
[Liu, Q.] F;Forestry College, Central South University of Forestry and Technology, Changsha, China
