NDLI: Effect of abiotic stress on the gameophyte of Pyropia katadae var. hemiphylla (Bangiales, Rhodophyta)

Content Provider	Springer Nature Link
Author	Wang, Wen Jun Sun, Xiu Tao Liu, Fu Li Liang, Zhou Rui Zhang, Ji Hong Wang, Fei Jiu
Copyright Year	2015
Abstract	Pyropia germplasm qualified for drift system culture is highly applicable in China. The current farmed species are tolerant to abiotic stresses, but vulnerable without air drying. Pyropia katadae var. hemiphylla inhabits mid-intertidal marshes and is a candidate for drift-system farming. Here, the performance of the gametophytes under varying environmental conditions was investigated. The thalli endured a short period (<5 days) at 22 °C, but was highly vulnerable to 28 °C. During 8 days of culture, the thalli grew at 8 − 17 °C, and growth was higher at 8 °C. Thalli with water loss ≤ 34 % recovered the optimum photochemical efficiency of PS II (F $_{v}$/F $_{m}$) by up to 100 %, and the net photosynthetic rate (P $_{n}$) by over 70 %. This reduced to 50 % in the thalli with water loss ≥ 45 %. Removal of surface water and moderate water loss significantly increased photosynthesis recovery from 1 day of −20 °C freezing, and the maximum recovery (80 % P $_{n}$ and 97 % F $_{v}$/F $_{m}$) occurred in the thalli with water loss of ~30 %. During 10 days of culture, thalli maintained active photosynthesis and growth under salinity 22.6–36.6; however, those in salinity ≤ 7.8 or ≥50.6 lost fresh weight, while those in salinity ≤ 7.8 were characterized by reduced F $_{v}$/F $_{m}$, P $_{n}$, and heavy thallus disruption. The above results indicated that P. katadae var. hemiphylla thalli adapted to low temperature, moderate desiccation, freezing, and salinity fluctuation. A farming strategy for this species is discussed.
Starting Page	469
Ending Page	479
Page Count	11
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	28
Issue Number	1
e-ISSN	15735176
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chlorophyll fluorescence Dehydration Freezing Osmotic fluctuation Reproductive tissue Temperature Plant Sciences Freshwater & Marine Ecology Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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