NDLI: Breeding of an elite Laminaria variety 90-1 through inter-specific gametophyte crossing

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Breeding of an elite Laminaria variety 90-1 through inter-specific gametophyte crossing

Content Provider	Springer Nature Link
Author	Zhang, Quan Sheng Tang, Xue Xi Cong, Yi Zhou Qu, Shan Cun Luo, Shi Ju Yang, Guan Pin
Copyright Year	2007
Abstract	Laminaria longissima and Zaohoucheng No.1 (a commercial variety selected from Laminaria japonica) differ to a certain extent in their morphological characteristics and biological habits. It was assumed that varieties bred through their hybridization should exhibit high yield potential and tolerate relatively high seawater temperatures. Female gametophyte clones isolated from L. longissima were crossed with male clones isolated from Zaohoucheng No.1. Laminaria variety 90-1 was obtained after gametophyte crossing, continuous self-crossing and selection. This variety was genetically homozygous; the indices of variation of blade length, width and thickness of the final two selection cycles were 7–8%; i.e., not different significantly. Variety 90-1 grew faster, lost less tissue and had higher yield potential than two widely used commercial varieties of L. japonica (all commercial varieties currently used in China originate from this latter species). The blade of variety 90-1 increased 3.71 cm day$^{−1}$ on average during the whole period of cultivation, almost two-fold that of two controls, and growth was maintained even when seawater temperature was higher than 18°C–3°C higher than the temperature tolerated by other Laminaria varieties. Variety 90-1 increased yield by more than 70% over two controls and also synthesized desirable amounts of iodine, mannitol and algin. In blade length, variety 90-1 was more similar to L. longissima than to L. japonica, but more similar to L. japonica in blade width and thickness. Since the adoption of variety 90-1 in 1999, its culturing area has increased each year to reach its current area of 7,000 ha, i.e., almost one-third of the total cultivation acreage of Laminaria in China. Breeding of variety 90-1 has demonstrated that it is feasible to develop elite Laminaria varieties by crossing gametophytes from different Laminaria species in combination with successive self-crossing and selection.
Starting Page	303
Ending Page	311
Page Count	9
File Format	PDF
ISSN	09218971
Journal	Journal of Applied Phycology
Volume Number	19
Issue Number	4
e-ISSN	15735176
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-01-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	variety 90-1 gametophyte hybridization Laminaria japonica Laminaria longissima Ecology Hydrobiology Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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