Awn contribution to gas exchanges of barley ears |
| |
Authors: | QZ Jiang D Roche S Durham D Hole |
| |
Institution: | (1) Department of Plants, Soils and Biometeorology, Utah State University, Logan, UT 84322, USA;(2) Ecology Center, Utah State University, Logan, UT 84322, USA |
| |
Abstract: | The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under
a controlled environment using a Before-After Control-Impact Paired (BACIP) experimental design. From ear emergence to grain
maturity, plants were grown in pots at either 60 or 90 % of soil water holding capacity. Gas-exchange measurements of ears
were made 9 and 10 d after anthesis (DAA). On 11 DAA, awn removal was performed on half of the ears in each pot, followed
by measurements on both intact and de-awned ears on 12 and 13 DAA. Net photosynthetic (P
N) and transpiration (E) rates decreased significantly with awn removal, but dark respiration (R
D) rate was not affected. We estimated for each ear a temperature-adjusted respiration rate (R
a) from R
D. When we corrected P
N with R
a, we found that rates of spikelet photosynthesis were largely underestimated. Moderate water stress had minimal effect on
gas exchange of bracts and awns of the barley ear. Barley lines did not differ for any individual gas-exchange parameter. |
| |
Keywords: | BACIP design Hordeum net photosynthetic rate respiration rate transpiration |
本文献已被 SpringerLink 等数据库收录! |
|