Low contribution of photosynthesis and water-use efficiency to improvement of grain yield in Chinese wheat

Title:

Low contribution of photosynthesis and water-use efficiency to improvement of grain yield in Chinese wheat

Creator:

Chen, X. and Hao, M.-D.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:753acd73-eef1-40a9-a797-dc993419781e
uuid:753acd73-eef1-40a9-a797-dc993419781e
issn:0300-3604
doi:10.1007/s11099-015-0147-9

Subject:

fotosyntéza, photosynthesis, agronomic traits, flag leaf, grain number per area unit, highland agricultural system, jointing stage, rate of photosynthesis per leaf area unit, stomatal conductance, thousand-grain mass, transpiration rate, water-use efficiency, winter wheat, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

The contribution of photosynthesis to yield improvement is important to know in order to determine future breeding strategies. The objectives of this study were to determine the contribution of photosynthesis and water-use efficiency (WUE) to grain yield improvement of facultative wheat (Triticum aestivum L.) cultivars on the Loess Plateau of China released between 1937 and 2004. The grain yield has increased nearly sevenfold during this period. Surprisingly, these increases were not correlated with the rate of photosynthesis per unit of leaf area when the cultivars were planted and managed in the same environment. The increases were also not correlated with transpiration rate, stomatal conductance, or WUE, except at the jointing stage. The total increase in photosynthesis may be due to enlargement of photosynthetic area and photosynthesis duration. The grain yield was positively correlated with the number of grains per unit of area (r = 0.855, P<0.05), harvest index (HI) (r = 0.885, P<0.01), and thousand-grain mass (r = 0.879, P<0.01). The increase in grain yield was limited by the grain number and the grain size (sink-limited) and the yield improvement was attributed to a rise in HI over the last 70 years in a highland agricultural system in China., X. Chen, M. -D. Hao., and Obsahuje seznam literatury

Language:

Multiple languages

Rights:

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

Coverage:

519-526

Source:

Photosynthetica | 2015 Volume:53 | Number:4

Harvested from:

CDK

Metadata only:

false