Call for Papers of the 9th World Potato Congress

The 9th World Potato Congress will be held in Yanqing, Beijing, China from 28 to 30 July 2015, which is hosted by Beijing Municipal People’s Government and Ministry of Agriculture (MOA) of the People's Republic of China, organized by Agricultural Trade Promotion Center of MOA, and Beijing Municipal Commission of Rural Affairs and Yanqing County People's government, working in concert with Potato Association of China (PAC) and Beijing Municipal Bureau of Agriculture. With a theme of “Develop Together For a Better Future”, the Congress aims to provide a platform of learning and exchange of knowledge and experience for potato industry insiders worldwide.

To facilitate exchange, the organizing committee cordially invites colleagues in the potato sector to submit Abstracts of papers on potato-related subjects, including but not limited to:

    ●Water challenges and opportunities in potato production
    ●Potato consumption and markets
    ●Major potato diseases
    ●Potato variety breeding
    ●Communications for promoting the potato
    ●Storage and processing technology
    ●Application of Biotechnology in potato breeding
    ●Potato mechanization
    ●Crop Management

    The Abstract shall be submitted before 31 March, 2015 and prepared on A4 paper (about 1 page), with 10.5 points, typeface Song (for Chinese) and Times New Roman (for English), and single spacing. It shall cover elements including title, author(s), affiliation, address, postal code and the text. Below the abstract, please indicate the subject category and whether a poster is to be submitted.

E-mail: chinapotatopark@163.com

TEL: +86-10-69148359

Official Website: http://www.2015bjwpc.com/potato_en/

Organizing Committee of the 9th World Potato Congress

May 15，2014

Effects of Sustained Weak Light on Seedling Growth and Photosynthetic Characteristics of Potato Seedlings

QIN Yu-zhi¹, XING Zheng¹, ZOU Jian-feng², HE Chang-zheng¹, LI Yan-lin¹, XIONG Xing-yao^1,3

1 College of Horticulture and Landscape, Hunan Agricultural University, Changsha, Hunan  410128, China;

2 Center of Analytical Service, Hunan Agricultural University, Changsha, Hunan 410128, China;

3 Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

Abstract: The aim of this study was to investigate the effects of sustained weak light on growing conditions and photosynthetic characteristics of potato leaves at the seedling stage and to offer a theoretical basis for screening and utilization of new resistant potato resources to weak light. The original cultivated potato Yan (S. tuberosum subsp. andigena var. yanacochense) and cultivated potato Favorita (S. tuberosum) were grown in a growth chamber at 50 μmol·m^-2·s^-1 and 350 μmol·m^-2·s^-1 light, respectively, using potato tuber (50 g) growing in medium. After 1 month treatment, the growth of the test materials was measured. Plant phenotype, the chlorophyll content, net photosynthetic rate, photosynthetic curve, the CO₂ response curve were tested by LI-COR 6400 portable photosynthesis system. The stomatal morphological characters were measured using JEM-1200EX scanning electron micrography. The ultrastructure of chloroplast was observed by transmission electron icroscope using the blade section after uranium acetate-citrate double staining. There was a difference between the treatment and the control in leaf size, morphology of plant. Favorita had weak vigour, slender seedling with smaller pale green foliage. Foliage and branch induction of Yan were very difficult and grew extremely slowly in or after treatment. Sustained light treatment significantly reduced the apparent quantum yield (AQE), light saturation point (LSP), maximum net photosynthetic rate (Pnmax), CO₂ saturation concentration (CSP), and the chlorophyll content efficiency, and improved apparent carboxylation rate (EC), and CO₂ compensation concentration (CCP) simultaneously. The light compensation point (LCP) of Yan was activated in the treatment. While the LCP and EC of Favorita were reverse. The EC, CSP of Yan had no difference between the treatment and the control. Growing under weak light, the stomatal density, chloroplast number declined. The numbers of grana and grana lamellae increased in Favorita. On the contrary, the number of grana lamellae decreased in Yan. Foliage differentiation of potato was hypersensitivity to light. There was a significant genotypic difference. The development and growth of the sensitive genotypes were hindered when plants acclimated to low light (50 μmol·m^-2·s^-1). The damage could not be resumed by restoring strong light later. The sustained weak light treatment at seedling stage depressed photosynthetic rate (Pn) and dark respiration rate (Rday). Saturation point of plant fell off along with the light intensities reduced. Following the dark respiration rate (Rday) being decreased, Favorita potato could adapt to lower light intensity by reducing the light compensation point. On the contrary, Yan could not adapt to lower light intensity. Appeared organic matter accumulated difficulties because of the improved light compensation point (LCP), the narrowing effective intensity range and the increased dark respiration rate (Rday). Under sustained weak light stress, the mesophyll cell arrangement was changed, and the stomatal density, the stomatal apparatus and numbers of chloroplasts decreased significantly, the stomatal apparatus length-width ratio had a tendency to increase, and chlorophyll composition ratio changed. Favorita potato improved the capture ability of effective light sources by increasing the number of chloroplast grana, grana lamella and chlorophyll b. Yan potato had subdued capturing ability of effective light and CO₂ affinity because the formation of chloroplast grana was affected and the number of chloroplast grana, grana lamella and stomatal density decreased. (Crop management; No poster)

第九届世界马铃薯大会征稿

第九届世界马铃薯大会将于2015年7月28~30日在北京延庆举行，本届世界马铃薯大会由北京市人民政府和中国农业部主办，农业部农业贸易促进中心、北京市农村工作委员会、延庆县人民政府承办，中国作物学会马铃薯专业委员会、北京市农业局协办，会议主题是“面向未来，共同发展”，旨在世界范围内为马铃薯产业内人士提供一个学习交流的平台。
    为了便于交流，大会筹委会诚邀世界马铃薯产业界的同仁积极投稿，内容包括但不限于以下领域：
    1．马铃薯生产中水资源挑战和机遇
    2．马铃薯消费与市场
    3．马铃薯主要病害
    4．马铃薯品种选育
    5．提高公众对马铃薯认识
    6．马铃薯贮藏加工
    7．生物技术在马铃薯育种中的应用
    8．马铃薯机械化
    9．马铃薯作物综合管理

大会筹委会要求2015年3月31日前提交论文摘要，中文或英文均可。

摘要长度为1页左右，A4纸，5号字，中文宋体，英文Times New Roman，单倍行距。内容包括：题名、作者、作者单位、单位所在地和邮编、摘要具体内容。在摘要下方要注明投稿所属领域，是否提交海报。

论文提交邮箱：chinapotatopark@163.com

联系电话：010-69148359

大会官网：http://www.2015bjwpc.com/

第九届世界马铃薯大会组委会

2014年5月15日

持续弱光胁迫对马铃薯苗期生长和光合特性的影响

秦玉芝¹，邢 铮¹，邹剑锋²，何长征¹，李炎林¹，熊兴耀^1,3

1：湖南农业大学园艺园林学院，湖南，长沙，中国，410128；

2：湖南农业大学分析测试中心，湖南，长沙，中国，410128；

3：中国农业科学院蔬菜花卉研究所，北京，中国，100081.

摘要：探讨持续弱光对马铃薯幼苗光合生理特性的影响，进行不同基因型对弱光适应性差异的植物学与细胞学性状的系统研究，为马铃薯耐弱光遗传资源的筛选和利用提供依据。以马铃薯原始栽培种Yan（Solanum tuberosum subsp. andigena var. yanacochense）和普通栽培品种Favorita（S. tuberosum）为供试材料，选用50 g 马铃薯块茎播种，进行基质盆栽，萌芽后用人工气候箱进行50 μmol·m^-2·s^-1 的持续弱光处理（对照光强为350μmol·m^-2·s^-1）。1 个月后分析测定各处理的生长状况；采用LI-COR 6400 便携式光合作用仪测定功能叶片的净光合速率、光合曲线参数、CO₂ 曲线参数、叶绿素含量；功能叶片主脉两侧切取大小1-2 mm 见方小块，处理后用JEM-1200EX 型电镜扫描观察叶片气孔并照相，分析统计单位面积气孔数量、测量气孔长度与宽；功能叶片经前处理后用LKB-5 型超薄切片机切片，醋酸铀-柠檬酸铅双重染色，JGE-1200EX 型透射电镜观察叶绿体超微结构、测量并照相。苗期持续弱光处理使马铃薯Favorita 植株明显徒长，叶片变小变薄，但枝叶分化不受影响；原始栽培种Yan 则枝叶分化困难，处理过程中生长缓慢，处理后加强环境光照强度亦无法恢复其生长速度与长势；持续弱光处理使两种基因型马铃薯叶片光作用的表观量子效率（AQE）、光合作用饱和点（LSP）、叶片最大净光合速率（Pnmax）、CO₂ 饱和点（CSP）、叶绿素含量降低；表观羧化率（EC）、CO₂ 补偿点（CCP）上升；Favorita 的光补偿点（LCP）、表观羧化率（EC）下降；Yan 的光补偿点（LCP）上升，表观羧化率（EC），CO₂ 饱和点（CSP）与对照差异不显著。长期弱光胁迫使马铃薯叶片气孔密度，叶绿体数量下降。Favorita的叶绿体基粒数、基粒片层数含量升高，Yan 的叶绿体基粒片层数不增反降。不同基因型枝叶分化对光的敏感性不同，差异明显。环境光照不足，敏感基因型的发育与生长都受到严重阻碍，伤害无法通过后期增强光照恢复。持续弱光胁迫使马铃薯叶片光合速率显著下降，对强光的利用能力减弱。适应强的材料（Favorita）可利用最小光强下调，即对弱光的利用能力增强，同时暗呼吸速率降低；而适应弱的材料（Yan）可利用最小光强则上调，可利用光强范围变窄，暗呼吸速率仍然维持较高水平，致使有机物合成和积累困难。持续弱光胁迫改变了马铃薯叶肉细胞排列方式，使叶片气孔密度下降，气孔器变小，气孔器长宽比有增加的趋势，细胞叶绿体数量减少，叶绿素成分比例改变。适应性较强的基因型通过增加叶绿体基粒数、基粒片层数和叶绿素b 的含量来提高胁迫下对有效光源的捕捉能力；敏感基因型叶绿体基粒的形成受到影响，基粒片层数，气孔密度显著减少，有效光源捕捉能力和CO₂ 亲和力显著下降。

研究领域：作物管理

不提交海报