Effects of Mixed Salt Stress on Biomass and Root Architecture of Iris lactea var. chinensis

doi:10.11924/j.issn.1000-6850.casb20190500198

Abstract

Abstract:

The paper aims to study the effects of different salt stresses on the growth of the Iris lactea var. chinensis seedlings. The effects of NaCl and NaHCO₃ single salt and different concentrations of salt solution on the root morphology, the ratio of dry weight to fresh weight in aboveground and underground, and the biomass were studied by means of indoor culture. The results showed that with the prolongation of stress time, the effect of 0.3% NaCl on leaf number and plant height growth was the smallest, followed by three mixed salt solutions, and the plant height increase reached the maximum on the 14 ^th day. The ratio of dry weight of shoots in the shoots treated with 0.3% NaHCO₃ was 2.17 times of that of the blank control, and the dry weight of the shoots was 56.61% of the blank control. With the increase of NaHCO₃ concentration in the mixed solution, the ratio of dry and fresh weight of the aboveground part showed an upward trend, and the ratio of dry to fresh weight in the ground showed a downward trend. After 35 days of treatment, the root length and root surface area of the horseshoe roots of 0.3% NaHCO₃ stress decreased significantly compared with the control, by 39.73% and 26.08%, respectively, but there was no significant difference in root volume between the treatments. The results showed that 0.3% NaHCO₃ solution had the strongest stress on the seedlings of Iris lactea var. chinensis, and the stress of the two single salts on the roots was stronger than that of the mixed salt, while the 0.3% NaCl solution had the weakest effect on the growth.

Key words: Iris lactea var. chinensis, salt stress, root morphology, dry and fresh weight, biomass

CLC Number:

Yuan Zebin, Mu Changhong, Ouyang Xiuqin, Wang Bo, Sun Xiangli. Effects of Mixed Salt Stress on Biomass and Root Architecture of Iris lactea var. chinensis[J]. Chinese Agricultural Science Bulletin, 2020, 36(16): 55-60.

Figures/Tables 5

References 25

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盐溶液组合	根系总长/cm	根系表面积/cm²	根系平均直径/mm	根系总体积/cm³	根尖数/个
CK	294.11±52.10a	63.33±6.03a	0.69±0.05c	1.09±0.02a	1595.00±225.09ab
0.3%NaCl	214.54±36.99bc	51.45±3.97cd	0.77±0.09abc	0.99±0.10a	1233.20±176.03b
0.2%NaCl+0.1%NaHCO₃	281.21±50.30a	59.47±5.32ab	0.68±0.07c	1.01±0.11a	1655.40±442.52a
0.15%NaCl+0.15%NaHCO₃	241.09±17.43ab	53.86±3.51bc	0.71±0.03bc	0.96±0.08a	1480.25±200.81ab
0.1%NaCl+0.2%NaHCO₃	203.58±16.62bc	51.63±2.87cd	0.81±0.08ab	1.01±0.11a	1463.75±187.69ab
0.3%NaHCO₃	177.25±19.60c	46.81±3.31d	0.85±0.10a	1.00±0.17a	1305.20±245.93ab

盐溶液组合	根系总长/cm	根系表面积/cm²	根系平均直径/mm	根系总体积/cm³	根尖数/个
CK	294.11±52.10a	63.33±6.03a	0.69±0.05c	1.09±0.02a	1595.00±225.09ab
0.3%NaCl	214.54±36.99bc	51.45±3.97cd	0.77±0.09abc	0.99±0.10a	1233.20±176.03b
0.2%NaCl+0.1%NaHCO₃	281.21±50.30a	59.47±5.32ab	0.68±0.07c	1.01±0.11a	1655.40±442.52a
0.15%NaCl+0.15%NaHCO₃	241.09±17.43ab	53.86±3.51bc	0.71±0.03bc	0.96±0.08a	1480.25±200.81ab
0.1%NaCl+0.2%NaHCO₃	203.58±16.62bc	51.63±2.87cd	0.81±0.08ab	1.01±0.11a	1463.75±187.69ab
0.3%NaHCO₃	177.25±19.60c	46.81±3.31d	0.85±0.10a	1.00±0.17a	1305.20±245.93ab