Different Responses to Low Potassium Stress Between Two Sugarcane Varieties from the Same Hybrid Combination

doi:10.3969/j.issn.1000-2561.2021.03.019

Abstract

Abstract:

Two sugarcane varieties (YT55 and YT00-236) from the same hybrid combination were used to analyze the different responses to low potassium (K) stress. The growth parameters, K contents, K utilization and uptake effeciency under longterm low K stress, and the K contents, activites of antioxidative enzymes under shortterm low K stress were investigated. The results revealed that significant differences were found for height, diameter, biomass between the two varieties under longterm low K stress. The height, diameter, shoot and root biomass decreased significantly in YT55 under longterm low K stress, while only root biomass showed noticeable reduction in YT00-236. The K contents in shoots and roots of the two varieties decreased under longterm low K stress. The rate decrease of K content in YT55 was higher than that in YT00-236 under longterm low K stress, but the utilization effeciency and uptake effeciency in YT00-235 were higher than those in YT55. The K content in the roots of YT55 began to decrease after 48 h under low K stress, whereas significant reduction was found for K content in the roots of YT00-236 after 24 h under low K stress. The MDA content in the roots of YT55 showed significant increase after 48 h under low K stress, but after 72 h under low K stress in the roots of YT00-236. The activities of SOD and POD decreased under low K stress in roots of YT55, but notably increased after 48 h under low K stress in the roots of YT00-236. These results indicated that significant difference for low K tolerance existed between the varieties from the same hybrid combination. Improvement in K utilization and uptake effeciency and activities of antioxidative enzymes might help to increase the low K tolerance in sugarcane.

Key words: sugarcane, low K stress, K content, activities of antioxidative enzymes

CLC Number:

S566.1

ZENG Qiaoying, WU Jiayun, FENG Xiaoming, ZHANG Nannan, WU Zilin, QI Yongwen. Different Responses to Low Potassium Stress Between Two Sugarcane Varieties from the Same Hybrid Combination[J]. Chinese Journal of Tropical Crops, 2021, 42(3): 739-746.

Figures/Tables 8

Fig. 1 Effect of longterm low K stress on growth of two varieties from same hybrid combination CK represents normal potassium treatment, LK represents low potassium treatment; Different lowercase letters above the bar indicate significant difference between two treatments of the same variety (P<0.05).

Fig. 2 Effect of longterm low K stress on K content of two varieties from same hybrid combination K content in shoots and roots represents as K amount per g of dry weight; CK represents normal potassium treatment, LK represents low potassium treatment; Different lowercase letters above the bar indicate significant difference between two treatments of the same variety (P<0.05).

Fig. 3 Effect of longterm low K stress on K utilization and uptake effeciency of two varieties from same hybrid combination CK represents normal potassium treatment, LK represents low potassium treatment; Different lowercase letters above the bar indicate significant difference between two treatments of the same variety (P<0.05).

Fig. 4 Effect of shortterm low K stress on K content of two varieties from same hybrid combination K content in shoots and roots represents as K amount per g of dry weight; CK represents normal potassium treatment, LK represents low potassium treatment.

Tab. 1 MDA contents in roots of two varieties from same hybrid combination under shortterm low K stress nmol?g?1

处理时间 Time of treatment	YT55		YT00-236
处理时间 Time of treatment	CK	LK	CK	LK
24 h	5.09±0.72	6.14±0.27	4.66±0.28	5.16±0.40
48 h	2.95±0.27	3.94±0.32^*	3.30±0.06	3.75±0.16
72 h	3.39±0.29	3.75±0.25	3.23±0.38	4.97±0.33^*
15 d	2.99±0.24	2.52±0.16	2.83±0.25	3.59±0.47

Tab. 2 Activities of SOD enzymes in roots of two varieties from same hybrid combination under shortterm low K stress U?g?1

处理时间 Time of treatment	YT55		YT00-236
处理时间 Time of treatment	CK	LK	CK	LK
24 h	231.92±17.49	180.61±16.74	259.87±23.86	199.01±10.98^*
48 h	206.62±12.43	189.02±4.54	223.25±14.20	270.64±8.37^*
72 h	392.50±23.79	345.14±28.74	344.44±16.30	432.64±4.31^*
15 d	339.17± 9.33	315.34±4.95	254.11±6.38	276.77±13.41

Tab. 3 Activities of POD enzymes in roots of two varieties from same hybrid combination under shortterm low K stress ΔOD470?g?1?min?1

处理时间 Time of treatment	YT55		YT00-236
处理时间 Time of treatment	CK	LK	CK	LK
24 h	668.03±71.03	510.06±50.73	565.63±69.21	430.94±29.33
48 h	501.33±37.00	427.32±17.07	495.29±57.60	541.57±46.37
72 h	562.58±31.26	475.60±30.76	451.48±21.69	649.13±44.71^*
15 d	383.17±4.50	391.77±19.62	417.52±15.64	400.70±11.67

Tab. 4 Activities of CAT enzymes in roots of two varieties from same hybrid combination under shortterm low K stress ΔOD240?g?1?min?1

处理时间 Time of treatment	YT55		YT00-236
处理时间 Time of treatment	CK	LK	CK	LK
24 h	4.16±0.19	3.89±0.18	4.15±0.17	3.88±0.29
48 h	3.57±0.18	2.69±0.15^*	4.01±0.06	3.24±0.24^*
72 h	3.46±0.25	3.15±0.15	3.75±0.22	3.22±0.21
15 d	2.59±0.14	2.17±0.19	2.48±0.03	2.41±0.12

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