期刊
PHOTOSYNTHESIS RESEARCH
卷 126, 期 2-3, 页码 363-373出版社
SPRINGER
DOI: 10.1007/s11120-015-0126-9
关键词
Photosynthetic rate; Wheat; Sucrose metabolism; Starch accumulation; Near isogenic lines
资金
- National Natural Sciences Foundation of China [31271634]
- National High Technology Research and Development Program of China [2012AA10A309]
- State Key Basic Research and Development Plan of China [2015CB150105]
The photosynthetic oxygen evolution rate, Hill reaction activity of seedlings and photosynthetic parameter, Pn-Ci curve and some source-sink metabolism-related enzyme activities, and substance content of flag leaves were measured by using two wheat near isogenic lines with significant differences in the photosynthetic rate of the 154 (high photosynthetic rate) and 212 (low photosynthetic rate) lines as materials. The results showed that the maximal carboxylation efficiency (Vcmax) and Hill reaction activity were higher in line 154 than that of line 212. The Pn in flag leaves of line 154 was significantly higher than that of line 212 during the anthesis to grain-filling stage. Higher leaf sucrose phosphate synthase activity, grain sucrose synthase activity, and grain ADPG pyrophosphorylase activity ensured that the photosynthate of line 154 could be transported to grains and translated into starch in a timely and effective manner, which also contributed to the maintenance of its high photosynthetic rate. Eventually, all of these factors of line 154 resulted in its higher grain yield compared with the low photosynthetic rate of line 212.
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