Citation
Marler T. E., . and Zozor Y., . (1996) Osmotic potential and photosynthetic characteristic of Waldin; avocado seedlings as influented by mild salinity. [Proceedings Paper]
Abstract
The influence of mild salinity on the physiology of ;Waldin; avocado Persea americana Mill. seedlings was studied using sand culture in two experiments. Seedlings were irrigated with a complete nutrient solution as the control and with this solution amended to 3 dS·m·1 with sea salt as the mild salinity treatment Leaf net CO2 assimilation AC02 of seedlings receiving salinity began to decline relative to that of the control seedlings by day 17 or 18 and stabilized at 48 to 55 of the control seedlings about day 24. The influence of salinity on AC02 was stable for the remainder of each experiment. Mild salinity did not influence dark respiration apparent quantum yield light compensation point for AC02; or leaf osmotic potential. The ratio of dark respiration to AC02 for salinitystressed seedlings was 50 of that for the control plants. Thus the daily loss of carbon through respiration was a greater proportion of the daily gain through AC02 for the salinitystressed seedlings as compared with the control seedlings. Root tissue of the salinitystressed seedlings was more negative than that of the control seedlings. The midday ratio of variable to maximal chlorophyll fluorescence was reduced by salinity stress on some days and sky conditions determined the days during which this response occurred. Measurement of AC02 may be useful for screening avocado germplasm as influenced by salinity stress.
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Abstract
The influence of mild salinity on the physiology of ;Waldin; avocado Persea americana Mill. seedlings was studied using sand culture in two experiments. Seedlings were irrigated with a complete nutrient solution as the control and with this solution amended to 3 dS·m·1 with sea salt as the mild salinity treatment Leaf net CO2 assimilation AC02 of seedlings receiving salinity began to decline relative to that of the control seedlings by day 17 or 18 and stabilized at 48 to 55 of the control seedlings about day 24. The influence of salinity on AC02 was stable for the remainder of each experiment. Mild salinity did not influence dark respiration apparent quantum yield light compensation point for AC02; or leaf osmotic potential. The ratio of dark respiration to AC02 for salinitystressed seedlings was 50 of that for the control plants. Thus the daily loss of carbon through respiration was a greater proportion of the daily gain through AC02 for the salinitystressed seedlings as compared with the control seedlings. Root tissue of the salinitystressed seedlings was more negative than that of the control seedlings. The midday ratio of variable to maximal chlorophyll fluorescence was reduced by salinity stress on some days and sky conditions determined the days during which this response occurred. Measurement of AC02 may be useful for screening avocado germplasm as influenced by salinity stress.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | stakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal SB 359 I61 1996 Vol. 2 Call Number |
| AGROVOC Term: | Avocados |
| AGROVOC Term: | Osmotic potential |
| AGROVOC Term: | Seedlings |
| AGROVOC Term: | Salinity |
| AGROVOC Term: | Persea americana |
| AGROVOC Term: | Irrigation |
| AGROVOC Term: | Nutrient solutions |
| AGROVOC Term: | Carbon assimilation |
| AGROVOC Term: | Respiration |
| AGROVOC Term: | Chlorophylls |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:14 |
| URI: | http://webagris.upm.edu.my/id/eprint/11960 |
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