The Effect of Environment on the Agar Yield and Gel Characteristics of Gracilaria sordida Nelson (Rhodophyta)
The Effect of Environment on the Agar Yield and Gel Characteristics of Gracilaria sordida Nelson (Rhodophyta)
复制标题
环境对红藻门琼脂产量和凝胶特性的影响
DOI：
10.1515/botm.1989.32.5.447
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
W. Laing
中科院分区：
文献类型：
--
作者：
J. Christeller;W. Laing
龙须菜(Gracilaria Sordida Nelson)是一种新西兰特有的无菌植物，在一定的光通量密度(PFD)、温度和氮素水平下，在受控条件下生长。然后，使用标准的工业经验参数：凝胶强度、凝胶变形和动态凝胶温度，分析从碱处理的干燥海藻样品中提取的琼脂的产量和质量。在10°C到30°C之间，琼脂产量随着水温的升高而降低，在不利于生长的氮素水平下增加，并且不受PFD的影响。凝胶强度随温度升高而增大，随PFD增大而减小。变形量不受温度和PFD的影响，但随施氮量的增加而减小。PFD和氮气对凝胶温度有影响，而生长温度对凝胶温度没有影响。在某些条件下，养殖海藻产生的产量和琼脂特性与港口种植的植物相当，琼脂凝胶强度在商业级琼脂范围内。
Gracilaria sordida Nelson (Rhodophyta), an agarophyte endemic to New Zealand, was grown under a range of photon flux density (PFD), temperature, and nitrogen levels under controlled conditions. Agar extracted from alkali-treated dried seaweed samples was then analysed for yield and quality using the standard industrial empirical parameters; gel strength, gel deformation and dynamic gelling temperature. Methods were developed to obtain this data from dried seaweed samples of about 1 g. Agar yield decreased with increasing water temperature between 10 °C and 30 °C, increased at nitrogen levels suboptimal for growth and was not affected by PFD. Gel strength increased with increasing temperature, and decreased with increasing PFD. Deformation was unaffected by temperature and PFD, but decreased with increasing nitrogen level. PFD and nitrogen altered the gelling temperature whereas growth temperature did not. Under certain conditions, cultured seaweed produced comparable yields and agar properties to those of harbour-grown plants and an agar gel strength within the range of commercial grade agars.