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Ear photosynthetic anatomy effect on wheat yield and water use efficiency
Author(s) -
Li Yuping,
Li Hongbing,
Zhang Suiqi,
Wang Ying
Publication year - 2020
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.1002/agj2.20154
Subject(s) - glume , photosynthesis , biology , vascular bundle , water use efficiency , poaceae , agronomy , yield (engineering) , botany , materials science , metallurgy
The screening of C 4 property in C 3 crops is an alteration that could improve photosynthetic capacity and efficiency, enhancing potential grain yield, particularly under water stress conditions. The present study aimed to determine how photosynthetic anatomy affects wheat ( Triticum aestivum ) photosynthetic rate and yield. Gas exchange and anatomical characteristics of the flag leaf and ear were compared in different ploidy wheats (diploid, tetraploid, and hexaploid) under well‐watered (WW) and water‐stressed (WS) conditions. The photosynthetic rate of the ear (P N _ear) decreased to a lesser extent than that of the flag leaf (P N _leaf) under WS and that the P N _ear of tetraploid wheat decreased the least. Furthermore, the integral water‐use efficiency (WUE i ) of tetraploid wheat increased the most among the three wheat species. The anatomical characteristics varied not only between the WW and WS conditions but also between the three wheat species; tetraploid species showed higher stomatal frequency (SF), stomatal area per organ area (SA), vein distance (D V ), and bundle‐sheath cell number (N BS ), and lower vein distance in the glume and lemma. Correlation analysis showed that grain yield presented significant positive correlation with the P N _leaf, P N _ear, and WUE i . The P N _leaf was affected by stomatal length (SL), stomatal width, and SA, while the P N _ear was affected by SF, SA, and stomatal size in the ear organs. The WUE i was generally positively correlated with SL, N V , and N BS in the ear organs. The higher vein density and well‐developed bundle sheath of tetraploid species may contribute to the higher P N _ear and lower decrease in grain yield.