Crops ›› 2023, Vol. 39 ›› Issue (2): 100-105.doi: 10.16035/j.issn.1001-7283.2023.02.014

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Effects of Spraying Rare Earth Micro-Fertilizer on Growth and Physiological Characteristics of Flue-Cured Tobacco under Drought Stress

Shan Jiaye1(), Zhang Xuewei2(), Yan Min3, Yang Jian3, Wang Fei3, He Jixian3, Hu Gang3, Wang Yuchen1, Jing Yanqiu1(), Lei Qiang3()   

  1. 1College of Tobacco, Henan Agricultural University, Zhengzhou 450002, Hehan, China
    2Guangdong Tobacco Industry Co., Ltd., Guangzhou 510000, Guangdong, China
    3Sichuan Branch of China National Tobacco Company, Chengdu 610041, Sichuan, China
  • Received:2022-03-01 Revised:2022-04-18 Online:2023-04-15 Published:2023-04-11

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Abstract:

A pot experiment was conducted to study the effects of different concentrations of rare earth micro- fertilizer on the growth and physiological characteristics of flue-cured tobacco under drought stress in vigorous growth stage. The results showed that, low concentration (50, 100mg/L) of rare earth micro-fertilizer promoted the root development of flue-cured tobacco, significantly improved the root activity and root biomass, while high concentration (300mg/L) of rare earth micro-fertilizer showed a certain inhibitory effects. Different concentrations of rare earth micro-fertilizer could improve the activities of superoxide dismutase and peroxidase, maintain the activity of catalase, and enhance the accumulation of proline and soluble protein, but the effects was not obvious with the increase of concentration, or even reverse. 100mg/L rare earth micro-fertilizer treatment had the most prominent performance in promoting the growth of tobacco plants, opening tobacco leaves, improving stress resistance and the drought resistance.

Key words: Rare earth micro-fertilizer, Flue-cured tobacco, Drought stress, Reclaimed water, Roots, Antioxidant enzymes

Table 1

Effects of different treatments on agronomic characters of tobacco"

处理
Treatment		 日期（月-日）
Date
(month-day)		 最大叶长
Maximum
length of leaf		 最大叶宽
Maximum
width of leaf		 最大叶面积
Maximum area
of leaf (cm2)		 节距
Pitch
(cm)		 茎围
Stem girth
(cm)		 株高
Plant height
(cm)
CK 06-09 47.97±4.76a 19.93±0.43a 605.74±47.13a 2.33±0.16a 5.56±0.42a 26.50±2.15a
06-19 63.66±2.76a 21.94±0.44b 885.83±20.67b 2.95±0.37a 6.21±0.67a 36.83±2.85c
增幅 32.71% 10.09% 46.24% 26.88% 11.69% 38.98%
T1 06-09 45.85±3.62a 19.71±0.16a 573.19±41.57a 2.25±0.30a 6.18±0.96a 29.83±1.99a
06-19 65.45±2.18a 21.52±1.65b 895.20±98.26b 3.10±0.18a 6.95±0.41a 44.27±1.29b
增幅 42.75% 9.18% 56.18% 37.78% 12.46% 48.41%
T2 06-09 48.46±2.94a 19.91±0.51a 612.92±52.69a 2.50±0.51a 6.35±0.70a 30.67±4.33a
06-19 67.29±2.96a 24.87±0.58a 1062.50±71.20a 3.59±0.09a 6.85±0.72a 51.28±1.05a
增幅 38.86% 24.91% 73.35% 43.60% 7.87% 67.20%
T3 06-09 46.74±2.99a 19.89±0.18a 589.79±32.87a 2.77±0.14a 6.05±0.35a 31.25±3.22a
06-19 61.38±5.69a 20.73±0.59b 806.10±53.48b 3.35±0.33a 6.55±0.31a 51.85±4.56a
增幅 31.32% 4.22% 36.68% 20.94% 8.26% 65.92%

Table 2

Effects of different treatments on tobacco biomass"

处理
Treatment		 日期（月-日）
Date (month-day)		 生物量Biomass (g) 根冠比
Root shoot ratio
根系Root
Root system		 茎叶Shoot
Cauline leaf		 总量Biomass
Overall amount
CK 06-09 6.46±0.56ab 30.22±2.96a 36.68±4.16a 0.22±0.02ab
06-19 9.24±0.86ab 41.07±1.94a 50.31±4.11a 0.23±0.03ab
增幅 43.03% 35.90% 37.16% 4.54%
T1 06-09 5.96±0.79ab 26.36±4.79a 32.32±6.87a 0.23±0.01ab
06-19 8.92±1.28b 36.84±0.28a 45.76±1.79ab 0.24±0.02ab
增幅 49.66% 39.76% 41.58% 4.35%
T2 06-09 6.90±0.30a 28.10±1.89a 35.00±7.07a 0.25±0.04a
06-19 10.56±0.18a 39.51±6.93a 50.07±3.42a 0.27±0.03a
增幅 53.04% 40.60% 43.06% 8.00%
T3 06-09 5.48±0.85b 28.79±3.64a 34.27±2.16a 0.19±0.02b
06-19 7.23±0.46c 35.60±6.71a 42.83±1.87b 0.20±0.02b
增幅 31.93% 23.65% 24.98% 5.26%

Fig.1

Root activities of different rare earth fertilizer treatments under drought stress The different lowercase letters mean significant difference between different treatments (P < 0.05), the same below"

Fig.2

Effects of different treatments on antioxidant enzyme activities of tobacco"

Fig.3

Effects of different treatments on MDA content in tobacco"

Fig.4

Effects of different treatments on tobacco osmoregulation substances"

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