Effects of NaCl Stress on Seed Germination and Seedling Growth of Daylily

doi:10.11924/j.issn.1000-6850.casb2022-0477

Abstract

Abstract:

To reveal the physiological mechanism of NaCl stress on daylily, effects of 40, 80, 120, 160 and 200 mmol/L of NaCl stress on seed germination, seedling growth height, plasma membrane permeability and other physiological indicators of daylily were studied in this paper. The results showed that when the concentration of NaCl stress was increased, the germination rate, germination index and germination potential of daylily seeds decreased correspondingly, the salt damage index gradually increased, and the growth height of daylily seedlings also decreased. When the concentration of NaCl was 120 mmol/L, the inhibitory effect on seed germination and seedling growth height of daylily was weak. The plasma membrane permeability and MDA content of different treatments increased with the increase of NaCl concentration, and kept increasing in 20 d. The contents of proline, soluble protein and soluble sugar in daylily leaves of different treatments increased first and then decreased. NaCl stress has obvious effects on the seed germination and seedling growth of daylily.

Key words: daylily, salt stress, seed germination, seedling growth, physiological index

YUE Xinli, ZHAN Runsheng, NIU Yayu, WANG Hui, XING Baolong, MA Tao. Effects of NaCl Stress on Seed Germination and Seedling Growth of Daylily[J]. Chinese Agricultural Science Bulletin, 2023, 39(16): 35-40.

Figures/Tables 7

References 28

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NaCl浓度/(mmol/L)	发芽率/%	发芽势/%	发芽指数/%	盐害指数/%
0	5.21±0.036a	3.13±0.032a	8.90±0.130a	—
40	4.17±0.087b	2.61±0.034b	5.00±0.020c	19.96
80	3.13±0.040d	2.09±0.020c	4.43±0.060d	39.92
120	3.65±0.049c	2.08±0.020c	5.78±0.020b	29.94
160	2.08±0.036e	1.04±0.015d	2.70±0.020e	60.08
200	0.52±0.010f	0.52±0.010e	0.18±0.010f	90.02

NaCl浓度/(mmol/L)	发芽率/%	发芽势/%	发芽指数/%	盐害指数/%
0	5.21±0.036a	3.13±0.032a	8.90±0.130a	—
40	4.17±0.087b	2.61±0.034b	5.00±0.020c	19.96
80	3.13±0.040d	2.09±0.020c	4.43±0.060d	39.92
120	3.65±0.049c	2.08±0.020c	5.78±0.020b	29.94
160	2.08±0.036e	1.04±0.015d	2.70±0.020e	60.08
200	0.52±0.010f	0.52±0.010e	0.18±0.010f	90.02