Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition
Three-year-old potted longan (Dimocarpus longan Lour. cv. Shixia) trees were treated with potassium chlorate and effects on nitrogen and carbon nutrition were examined. The results showed that potassium chlorate at 10 and 20 g per pot failed to induce flower but suppressed shoot growth and caused le...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2017-11-01
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| Series: | Horticultural Plant Journal |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468014117303485 |
| _version_ | 1797203345587306496 |
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| author | Jiemei LU Ruitao YANG Huicong WANG Xuming HUANG |
| author_facet | Jiemei LU Ruitao YANG Huicong WANG Xuming HUANG |
| author_sort | Jiemei LU |
| collection | DOAJ |
| description | Three-year-old potted longan (Dimocarpus longan Lour. cv. Shixia) trees were treated with potassium chlorate and effects on nitrogen and carbon nutrition were examined. The results showed that potassium chlorate at 10 and 20 g per pot failed to induce flower but suppressed shoot growth and caused leaf chlorosis and drop. The treatment significantly inhibited nitrate reductase but increased nitrogen concentration in the leaves and buds. Concentration of soluble amino acids in the leaves of treated trees increased within 14 days and then declined to the control level, while it increased constantly in buds. In both organs, the amino acid increase was an all-round one, with all the tested 21 amino acids increased. However, soluble proteins in the leaves were slightly increased by chlorate, indicating that de novo synthesis of amino acids was activated. Chlorate reduced photosynthetic rate and stomatal conductance but slightly increased CO2 concentration in the mesophyll, suggesting that chlorate treatment damaged photosynthetic apparatus. The damage was reflected by the destruction of thylakoids and grana in the chloroplasts. Chlorate also caused depletion of starch with significant accumulation of soluble sugars in the leaves. Accumulation of sugars and soluble amino acids indicates osmotic adjustment in response to the stress caused by chlorate treatment. |
| first_indexed | 2024-04-24T08:17:52Z |
| format | Article |
| id | doaj.art-179e96c2b8244cfa87c90390aa878098 |
| institution | Directory Open Access Journal |
| issn | 2468-0141 |
| language | English |
| last_indexed | 2024-04-24T08:17:52Z |
| publishDate | 2017-11-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Horticultural Plant Journal |
| spelling | doaj.art-179e96c2b8244cfa87c90390aa8780982024-04-17T02:44:29ZengKeAi Communications Co., Ltd.Horticultural Plant Journal2468-01412017-11-013623724610.1016/j.hpj.2017.12.003Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon NutritionJiemei LU0Ruitao YANG1Huicong WANG2Xuming HUANG3Physiological Laboratory for South China Fruits, College of Horticulture, South China Agricultural University, Guangzhou 510642, ChinaPhysiological Laboratory for South China Fruits, College of Horticulture, South China Agricultural University, Guangzhou 510642, ChinaPhysiological Laboratory for South China Fruits, College of Horticulture, South China Agricultural University, Guangzhou 510642, ChinaPhysiological Laboratory for South China Fruits, College of Horticulture, South China Agricultural University, Guangzhou 510642, ChinaThree-year-old potted longan (Dimocarpus longan Lour. cv. Shixia) trees were treated with potassium chlorate and effects on nitrogen and carbon nutrition were examined. The results showed that potassium chlorate at 10 and 20 g per pot failed to induce flower but suppressed shoot growth and caused leaf chlorosis and drop. The treatment significantly inhibited nitrate reductase but increased nitrogen concentration in the leaves and buds. Concentration of soluble amino acids in the leaves of treated trees increased within 14 days and then declined to the control level, while it increased constantly in buds. In both organs, the amino acid increase was an all-round one, with all the tested 21 amino acids increased. However, soluble proteins in the leaves were slightly increased by chlorate, indicating that de novo synthesis of amino acids was activated. Chlorate reduced photosynthetic rate and stomatal conductance but slightly increased CO2 concentration in the mesophyll, suggesting that chlorate treatment damaged photosynthetic apparatus. The damage was reflected by the destruction of thylakoids and grana in the chloroplasts. Chlorate also caused depletion of starch with significant accumulation of soluble sugars in the leaves. Accumulation of sugars and soluble amino acids indicates osmotic adjustment in response to the stress caused by chlorate treatment.http://www.sciencedirect.com/science/article/pii/S2468014117303485longanpotassium chloratenitrogen nutritioncarbon nutrition |
| spellingShingle | Jiemei LU Ruitao YANG Huicong WANG Xuming HUANG Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition Horticultural Plant Journal longan potassium chlorate nitrogen nutrition carbon nutrition |
| title | Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition |
| title_full | Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition |
| title_fullStr | Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition |
| title_full_unstemmed | Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition |
| title_short | Stress Effects of Chlorate on Longan (Dimocarpus longan Lour.) Trees: Changes in Nitrogen and Carbon Nutrition |
| title_sort | stress effects of chlorate on longan dimocarpus longan lour trees changes in nitrogen and carbon nutrition |
| topic | longan potassium chlorate nitrogen nutrition carbon nutrition |
| url | http://www.sciencedirect.com/science/article/pii/S2468014117303485 |
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