I am aware of high temperature tolerant cultivar of Porphyra haitanensis that has been developed through breeding and farmed extensively in China. There are also examples of Saccharina and Undaria spp in which improved strains were developed for commercial farming.
It would be helpful, if I may be provided with recent developments in the field of breeding in seaweeds.
The Chinese government distinguished four aquatic seaweed regions. The first region is the Yellow Sea & Bo Hai which includes Shandong province, Liaoning province, Hebei province and Tianjin municipality. This region has the largest output of seaweed products in China and mainly Laminaria and Undaria are produced (Ding, B.J., 1992). Yangzi River Delta is the second region which includes Jiangsu province, Shanghai municipality and Zhejiang province. In this area the main aquatic seaweed product is Porphyra. The third region is Taiwan province and Fujian province which mainly produce Laminaria and Porphyra. The fourth region is the South of China which include Guangdong province, Guangxi Province and Hainan Province which mainly produce Laminaria and Porphyra. The south of China is not very suitable for seaweed cultivation due to the high temperature of seawater. Your question may be related to this. =>Seaweed breeding technologies and strain improvement: Cultivation of seaweeds has markedly increased during the last couple of decades and this has and will lead to a plethora of biotechnological applications. Addition of different genomes has in practice successfully been applied for seaweeds in several cases. For example, agar production from a red Gracilaria seaweed species has been transferred from a cold water strain to a warm water strain by protoplast fusion (Cheney 1999)=> Cheney, D.P. (1999). Strain improvement of seaweeds thru genetic manipulation: current status. World Aquaculture 30: 55-56 &65.
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