Midday photoinhibition of two newly developed super-rice hybrids

Title:

Midday photoinhibition of two newly developed super-rice hybrids

Creator:

Wang, Q. A., Lu, C. M., and Zhang, Q. D.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:6b5bbbe7-b6e7-40a3-8a2a-5fdc38c7b866
uuid:6b5bbbe7-b6e7-40a3-8a2a-5fdc38c7b866
issn:0300-3604
doi:10.1007/s11099-005-0045-7

Subject:

chlorophyll fluorescence, cultivar differences, net photosynthetic rate, Oryza, photosystem 2, quantum yield, transpiration rate, and xanthophyll cycle

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Super-rice hybrids are two-line hybrid rice cultivars with 15 to 20 % higher yields than the raditional three-line hybrid rice cultivars. Response of photosynthetic functions to midday photoinhibition was compared between seedlings of the traditional hybrid rice (Oryza sativa L.) Shanyou63 and two super-rice hybrids, Hua-an3 and Liangyoupeijiu. Under strong midday sunlight, in comparison with Shanyou63, the two super-rice hybrids were less photoinhibited, as indicated by the lower loss of the net photosynthetic rate (PN), the quantum yield of photosystem 2 (ΦPS2), and the maximum and effective quantum yield of PS2 photochemistry (Fv/Fm and Fv'/Fm'). They also had a much higher transpiration rate. Hence the super-rice hybrids could protect themselves against midday photoinhibition at the cost of water. The photoprotective de-epoxidized xanthophyll cycle components, antheraxanthin (A) and zeaxanthin (Z), were accumulated more in Hua-an3 and Liangyoupeijiu than in Shanyou63, but the size of xanthophyll cycle pool of the seedlings was not affected by midday photoinhibition. Compared to Shanyou63, the super-rice hybrids were better photoprotected under natural high irradiance stress and the accumulation of Z and A, not the size of the xanthophyll pool protected the rice hybrids against photoinhibition. and Q. A. Wang, C. M. Lu, Q. D. Zhang.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

277-281

Source:

Photosynthetica | 2005 Volume:43 | Number:2

Harvested from:

CDK

Metadata only:

false