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首页> 外文学位 >INTERACTIONS BETWEEN LIGHT INTENSITY, TEMPERATURE AND NITROGEN ON GROWTH RATE, PHYSIOLOGICAL PROCESSES AND CHEMICAL COMPOSITION OF GRACILARIA TIKVAHIAE (RHODOPHYTA, GIGARTINALES).
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INTERACTIONS BETWEEN LIGHT INTENSITY, TEMPERATURE AND NITROGEN ON GROWTH RATE, PHYSIOLOGICAL PROCESSES AND CHEMICAL COMPOSITION OF GRACILARIA TIKVAHIAE (RHODOPHYTA, GIGARTINALES).

机译：光强，温度和氮之间的相互作用对ON草（GRA草）的生长速率，生理过程和化学组成的影响。

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摘要

Interactions between light intensity, temperature, and nitrate (NO(,3)('-)) availability on steady-state rates of growth, physiological processes, and levels of chemical constituents of the red alga Gracilaria tikvahiae (Gigartinales) were studied using factorial design experiments in outdoor, continuous-flow seawater cultures. Between 15 and 20(DEGREES)C, the maximum growth rate ((mu)(,max)) of G. tikvahiae was depressed by temperature and below 15(DEGREES)C, G. tikvahiae did not grow. After transfer of G. tikvahiae from field seawater temperature (22(DEGREES)C) to 15(DEGREES)C, a nine day lag period occurred before growth ensued. During this lag period, levels of carbon, nitrogen, protein and carbohydrate increased, suggesting that G. tikvahiae acclimates to low temperatures by increasing quotas of these cellular constituents. Between 20 and 30(DEGREES)C, G. tikvahiae utilized maximum levels of light intensity for growth and photosynthesis whereas at 15(DEGREES)C, significant photoinhibition of these processes occurred at high light intensities. Maximum values of growth and the photosynthesis:respiration ratio occurred at 25(DEGREES)C. Levels of chlorophyll-a, R-phycoerythrin, protein and nitrogen in G. tikvahiae varied inversely with light intensity; conversely, activity of ribulose-1,5-biphosphate carboxylase varied directly with light intensity. This biochemical light acclimation maximizes the photosynthetic capacity of G. tikvahiae to a particular light intensity. NO(,3)('-) limitation depressed rates of growth and photosynthesis in high light intensity, low NO(,3)('-) treatments. Two nitrogen reserves, tissue NO(,3)('-) and R-phycoerythrin, supported growth of the N-limited G. tikvahiae during an initial 19 day growth period. Overall, a high intercorrelation (0.87 < r < 0.96) between rates of growth, photosynthesis, NO(,3)('-) uptake, and dark respiration suggests that highly balanced growth of G. tikvahiae occurs over a broad environmental range of light, temperature and NO(,3)('-) availability--a physiological profile that accounts for the ecological success of G. tikvahiae.
机译：使用阶乘研究了光强度，温度和硝酸盐（NO（，3）（'-））可用性对稳态藻类生长速率，生理过程和化学成分含量的影响。室外连续流海水养殖的设计实验。在15至20（摄氏度）之间，温度降低了提克葡萄球菌的最大生长率（μ（max）），低于15（摄氏度），提克葡萄球菌没有生长。从地面海水温度（22（DEGREES）C）转移到15（DEGREES）C之后，tikvahiae菌转移了9天，之后才开始生长。在此滞后期间，碳，氮，蛋白质和碳水化合物的含量增加，这表明提克酵母通过增加这些细胞成分的配额而适应低温。在20至30（DEGREES）C之间，tikvahiae利用最大水平的光强度进行生长和光合作用，而在15（DEGREES）C下，这些过程在高光强度下发生了显着的光抑制作用。生长和光合作用：呼吸比的最大值出现在25（摄氏）℃。提克葡萄中叶绿素-a，R-藻红蛋白，蛋白质和氮的含量与光照强度成反比。相反，核糖-1,5-二磷酸羧化酶的活性随光强度直接变化。这种生化的光适应使tikvahiae的光合作用能力最大化，达到了特定的光强度。 NO（，3）（'-）限制了高光强度，低NO（，3）（'-）处理中的生长速率和光合作用。在最初的19天生长期间，两个氮储备（组织NO（，3）（'-）和R-藻红蛋白）支持了N限定的蒂克葡萄球菌的生长。总体而言，生长速率，光合作用，NO（，3）（'-）吸收和暗呼吸之间的高度相互关系（0.87

著录项

  • 作者

    LAPOINTE, BRIAN EDWARD.;

  • 作者单位

    University of South Florida.;

  • 授予单位 University of South Florida.;
  • 学科 Biological oceanography.
  • 学位 Ph.D.
  • 年度 1982
  • 页码 186 p.
  • 总页数 186
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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