Davis P A, Walsby A E
School of Biological Sciences, University of Bristol, Bristol BS8 1UG, UK.
New Phytol. 2002 Nov;156(2):225-239. doi: 10.1046/j.1469-8137.2002.00495.x.
• Differences in photosynthetic production and conversion to biomass of the red-coloured cyanobacterium Planktothrix rubescens and the green-coloured Planktothrix agardhii , were investigated in relation to their growth in Blelham Tarn, UK, using clonal isolates from the lake. • Growth rates (µ) were measured in cultures under 12 h : 12 h light : dark cycles at 15 irradiances ( E ) in temperatures (Θ) of 10-25°C. Photosynthetic rates ( P ) were measured under the same conditions. • For P. rubescens , µ reached a maximum of 0.33 d at 25°C in photon irradiances > 40 µmol m s and exceeded µ for P. agardhii over the range of temperatures in Blelham Tarn (< 21°C), although not at temperatures > 25°C. In P. rubescens , the dif ference (Δµ) between the growth rate of cell carbon (µ ), calculated from P , and µ was only 3% at 10°C but increased with temperature to 30% at 25°C; in P. agardhii , Δµ values were higher at low temperatures and lower at the higher temperatures. • Using algorithms describing the irradiance- and temperature-dependent growth rates and measured values of E and Θ at different depths in Blelham Tarn, it was demonstrated that P. rubescens would outgrow P. agardhii , though the latter might grow better in warmer and shallower lakes. We discuss the problems of modelling phytoplankton growth from measurements of in situ photosynthesis.
• 利用从英国布莱勒姆潭分离的克隆菌株，研究了红色蓝藻微红颤藻和绿色阿氏颤藻在光合产量以及生物量转化方面的差异，这些差异与它们在该湖泊中的生长情况有关。
• 在10 - 25°C的温度下，于12小时光照：12小时黑暗的循环条件下，对15种辐照度（E）下的培养物测定生长速率（µ）。在相同条件下测定光合速率（P）。
• 对于微红颤藻，在光子辐照度> 40 µmol m⁻² s⁻¹ 且温度为25°C时，µ 最高达到0.33 d⁻¹ ，在布莱勒姆潭的温度范围内（< 21°C），其µ 超过了阿氏颤藻，尽管在温度> 25°C时并非如此。在微红颤藻中，根据P计算的细胞碳生长速率（µc）与µ 之间的差异（Δµ）在10°C时仅为3%，但随温度升高至25°C时增加到30%；在阿氏颤藻中，Δµ 值在低温时较高，在高温时较低。
• 利用描述辐照度和温度依赖性生长速率的算法以及布莱勒姆潭不同深度处的E和Θ测量值，结果表明微红颤藻的生长速度会超过阿氏颤藻，不过后者在较温暖和较浅的湖泊中可能生长得更好。我们讨论了根据原位光合作用测量来模拟浮游植物生长的问题。
