Effects of Salt Stress on the Growth and Photosynthetic Characteristics of Squash Seedlings

doi:10.11923/j.issn.2095-4050.cjas2020-0193

Abstract

Abstract:

To study the tolerance of squash to salt stress, hydroponics was adopted to investigate the effects of different concentrations of NaCl (0, 50, 100, 150, 200 and 250 mmol/L) on the growth and photosynthetic characteristics of squash seedlings. The results indicated that with the increase of NaCl concentration, the plant height, fresh weight and dry weight of squash seedlings gradually declined. The chlorophyll content, stomatal conductance (Gs), net photosynthetic rate (Pn) and transpiration rate (Tr) first increased and then decreased with the NaCl concentration increase. With the increase of NaCl concentration, the relative ionic permeability (RIP) showed a trend of first decrease and then increase. There was no significant effect on the growth of squash seedlings when NaCl concentration ranged from 0 to 100 mmol/L, but when NaCl concentration was higher than 100 mmol/L, the survival rate and photosynthesis were significantly affected. The study demonstrates that squash has strong salt tolerance.

Key words: Salt Stress, Squash, Seedling Stage, Growth Index, Photosynthesis, Photosynthetic Characteristics

CLC Number:

S642.1

SHI Pibiao, JIANG Runzhi, SHEN Mingchen, GU Minfeng, WANG Chunyun, LI Yafang, GU Xiaobing. Effects of Salt Stress on the Growth and Photosynthetic Characteristics of Squash Seedlings[J]. Journal of Agriculture, 2021, 11(12): 74-79.

Figures/Tables 7

References 32

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NaCl浓度/(mmol/L)	苗高/cm	根长/cm	苗鲜重/g	苗干重/g
0	24.80a	22.73a	4.050a	0.386a
50	22.90ab	31.80a	3.583ab	0.373ab
100	22.93ab	31.27a	3.470abc	0.348ab
150	21.90ab	27.90a	3.171bc	0.331b
200	23.33ab	22.60a	2.911c	0.254c
250	19.90b	20.87a	1.614d	0.215c

NaCl浓度/(mmol/L)	苗高/cm	根长/cm	苗鲜重/g	苗干重/g
0	24.80a	22.73a	4.050a	0.386a
50	22.90ab	31.80a	3.583ab	0.373ab
100	22.93ab	31.27a	3.470abc	0.348ab
150	21.90ab	27.90a	3.171bc	0.331b
200	23.33ab	22.60a	2.911c	0.254c
250	19.90b	20.87a	1.614d	0.215c

NaCl浓度/(mmol/L)	叶绿素a	叶绿素b	总叶绿素
0	1.25ab	0.73cd	1.98cd
50	1.45a	0.80c	2.25bc
100	1.34ab	0.95b	2.29b
150	1.36ab	1.38a	2.74a
200	1.17b	0.62d	1.79d
250	0.41c	0.25e	0.66e

NaCl浓度/(mmol/L)	叶绿素a	叶绿素b	总叶绿素
0	1.25ab	0.73cd	1.98cd
50	1.45a	0.80c	2.25bc
100	1.34ab	0.95b	2.29b
150	1.36ab	1.38a	2.74a
200	1.17b	0.62d	1.79d
250	0.41c	0.25e	0.66e