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Journals / Turkish Journal of Botany / 2013 / Cilt: 37 - Sayı: 5

Role of exogenous glycinebetaine and humic acid in mitigating drought stress-induced adverse effects in Malus robusta seedlings

Lixin ZHANG
Mei GAO
Linsen ZHANG
Binzhi LI
Mingyu HAN
Ashok Kumar ALVA
Muhammad ASHRAF
Pages
920–929
Publication Date
2013-05-01
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

These results suggest that application of GB and HA could mitigate the deleterious effects of DS on Malus seedlings and offer an efficient, economical, and simple means to enhance DS tolerance of the apple rootstock.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Glycinebetaine (GB) and humic acid (HA) are 2 commercial growth regulators that are being used worldwide to enhance the tolerance of most crops, including fruit trees, to various stresses, including drought stress (DS).
📊
Key Findings & Data:The effects of different concentrations and combinations of GB (0, 100, and 200 mg L–1) and HA (0, 500, 1000, and 1500 mg L–1) on M. robusta seedling growth, photosynthesis characteristics, osmolyte accumulation, and antioxidant responses were evaluated under DS and non-DS conditions.
💡
Conclusion & Impact:These results suggest that application of GB and HA could mitigate the deleterious effects of DS on Malus seedlings and offer an efficient, economical, and simple means to enhance DS tolerance of the apple rootstock.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Key words: Glycinebetaine · humic acid · photosynthesis

Abstract

Glycinebetaine (GB) and humic acid (HA) are 2 commercial growth regulators that are being used worldwide to enhance the tolerance of most crops, including fruit trees, to various stresses, including drought stress (DS). Malus robusta Rehder is considered as one of the most important rootstocks for apple in China, but its growth and productivity is believed to be adversely affected by DS. The effects of different concentrations and combinations of GB (0, 100, and 200 mg L–1) and HA (0, 500, 1000, and 1500 mg L–1) on M. robusta seedling growth, photosynthesis characteristics, osmolyte accumulation, and antioxidant responses were evaluated under DS and non-DS conditions. GB and HA applied exogenously to drought-stressed M. robusta seedlings increased total dry matter, net photosynthetic rate, free proline content, endogenous glycinebetaine content, soluble sugar content, and potassium content as well as the activities of superoxide dismutase, peroxidase, and catalase. However, GB and HA decreased stomatal conductance and malondialdehyde content. The above-mentioned responses were greater for combined application of GB and HA as compared to application of only GB or HA. The best responses for most of the above parameters were with the application of 100 mg L–1 GB and 1500 mg L–1 HA. These results suggest that application of GB and HA could mitigate the deleterious effects of DS on Malus seedlings and offer an efficient, economical, and simple means to enhance DS tolerance of the apple rootstock.

Özet

Glycinebetaine (GB) and humic acid (HA) are 2 commercial growth regulators that are being used worldwide to enhance the tolerance of most crops, including fruit trees, to various stresses, including drought stress (DS). Malus robusta Rehder is considered as one of the most important rootstocks for apple in China, but its growth and productivity is believed to be adversely affected by DS. The effects of different concentrations and combinations of GB (0, 100, and 200 mg L–1) and HA (0, 500, 1000, and 1500 mg L–1) on M. robusta seedling growth, photosynthesis characteristics, osmolyte accumulation, and antioxidant responses were evaluated under DS and non-DS conditions. GB and HA applied exogenously to drought-stressed M. robusta seedlings increased total dry matter, net photosynthetic rate, free proline content, endogenous glycinebetaine content, soluble sugar content, and potassium content as well as the activities of superoxide dismutase, peroxidase, and catalase. However, GB and HA decreased stomatal conductance and malondialdehyde content. The above-mentioned responses were greater for combined application of GB and HA as compared to application of only GB or HA. The best responses for most of the above parameters were with the application of 100 mg L–1 GB and 1500 mg L–1 HA. These results suggest that application of GB and HA could mitigate the deleterious effects of DS on Malus seedlings and offer an efficient, economical, and simple means to enhance DS tolerance of the apple rootstock.

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Cite This Article

ZHANG, L., GAO, M., ZHANG, L., LI, B., HAN, M., ALVA, A. K., ASHRAF, M. (2013). Role of exogenous glycinebetaine and humic acid in mitigating drought stress-induced adverse effects in Malus robusta seedlings. Turkish Journal of Botany, Cilt: 37 - Sayı: 5, 920–929. https://ajindex.com/articles/182965

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