Leymus chinensis, a dominant species in the Songnen Plain of northeast China, has a strong ability to resist grazing and tolerate saline-alkali stress. Compensatory growth is a positive response of plants, when subjected to grazing or clipping stress; however, little information is available on how plant nitrogen allocation strategies affect compensatory growth under saline-alkali stress. A field experiment using two saline-alkali levels and three clipping levels was conducted in conjunction with the belowground 15N-urea labelling method. Irrespective of clipping and salt-alkali stress, moderate clipping significantly promoted allocation of newly-absorbed nitrogen (N) to shoots, resulting in high biomass and over-compensatory growth of L. chinensis. However, severe clipping dramatically decreased uptake of total 15N by 20% under saline-alkali conditions, resulting in under-compensatory growth, and plants allocated more N to stem bases than to other plant organs, showing a conservative N allocation strategy. Our results suggest that plants have different nitrogen allocation strategies under different combinations of environmental stresses.
|Number of pages||12|
|Journal||Plant Growth Regulation|
|State||Published - Sep 1 2020|
Bibliographical noteFunding Information:
This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 31870436, 31670446, 31471945 and U1803110), the National Key Basic Research Program of China (Grant No. 2016YFC0500703), and Jilin Special Program for Key Science and Technology Research (Grant No. Y8D1161001).
© 2020, Springer Nature B.V.
- Compensatory growth
- Leymus chinensis
- N allocation
- Saline-alkali stress
ASJC Scopus subject areas
- Agronomy and Crop Science
- Plant Science