Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Temperature and Saline Stress on Seedlings of Swietenia Macrophylla: a Comparative Study

M. Siddiqur Rahman
Institute of Forestry & Environmental Sciences, Chittagong University, Chittagong - 4331, Bangladesh

S. Akter
Department of Environment, Chittagong Division, Ministry of Environment & Forest, People's Republic of Bangladesh

M. Al-Amin
Institute of Forestry & Environmental Sciences, Chittagong University, Chittagong - 4331, Bangladesh

Abstract/ Executive Summary:

Physical responses of plants to change in climatic factors like temperature, precipitation and abiotic factors like salinity intrusion may lead positive or negative effects. Some factor may promulgate growth while other may stunts their vigour. Present study seeks growth of a plantation species at its early stage of life towards elevated temperature and saline water stresses. Growth records of Swietenia macrophylla seedlings were enumerated by measuring height, collar diameter and leaf number development of the replicates growing at an environment-controlled plant growth chamber. One experimented with merely elevated temperature while other tries to find results of combined effect of elevated temperature (30, 32 and 34°C) and saline (0.5, 1.5 and 2.5 g L^-1 NaCl) to said species seedlings. Seedling replicates showed diverse response to elevated temperature and saline irrigation at height, collar diameter and leaf number development. Results depict that elevated temperature alone might be positive for S. macrophylla seedlings, rather most favourable for its growth in height, however, collar diameter and leaf number may remain unaffected. Saline treatment along with higher temperature stresses may lead seedlings toward stunted or very low growth. As saline intensity increases, species growth tends to decrease proportionally. Elevated temperature aided with higher salinity may direct further under development of S. macrophylla seedlings which is distressing to plantation establishment of this species in sites which are vulnerable to salinity intrusion due to climate change. However, S. macrophylla may be a promising plantation species in drier part of the globe in near future.

Keywords: Swietenia macrophylla, Plant growth, Elevated temperature, Saline treatment, Plant growth chamber

Location: Tree propagation laboratory, IFES, University of Chittagong

Start Date: 00-01-2009

End Date: 00-03-2009

Program Area: Risk Management in Agriculture

Commodity: Tree

Objectives:

The aim of present study was to enunciate this species ability to withstand higher temperature (30-34°C) than its normal range (20-30°C) along with saline water treatment (0.5, 1.5 and 2.5 g L^-1 NaCl concentrations). This experiment might be helpful in asking the answer whether Swietenia macrophylla would be tenable to elevated temperature and saline stress in future or not.

Methodology:

Materials: Initial growth performance of S. macrophylla at three different parameters viz. height, collar diameter and number of leaves were measured by meter scale, slide callipers and manual reading, respectively. For temperature, light and humidity control the seedlings were reared in the Weiss Gallenkamp fitotron Plant Growth Chamber (Tree propagation laboratory, IFES, University of Chittagong). Temperature records were taken by atmospheric thermometer placed at outdoor condition to measure existing temperature. Study site and period: The experiment was conducted in the nursery and Tree Propagation laboratory of Institute of Forestry and Environmental Sciences, University of Chittagong, Bangladesh. Study conducted during the month of January, February and March 2009. The mean monthly temperature varies from 19.44°C in January to 28.88°C in May (UNEP. Samples: Healthy seedlings of same age and origin were used for treatments. For elevated temperature treatment, forty seedlings were taken, where replication was ten for each. While for combined experiment, thirty samples taken where replicates were three for each. A two-factor split-plot design with ten and three randomly assigned complete replications was used. Methods: Two types of experiments were conducted with different treatment to seedlings. Experiment 1: Temperature elevation at 30, 32 and 34°C compared with existing temperature (26.31°C). Experiment 2: Temperature elevation at 30, 32 and 34°C along with NaCl concentrations of 0.5, 1.5 and 2.5 g L^-1 in each of the three elevated temperature compared with existing temperature (26.31°C) and fresh water irrigation. Seedlings were reared in the Weiss Gallenkamp Plant Growth Chamber where the temperature, light intensity and relative humidity were controlled strictly. The growth chamber was programmed with a pick temperature of 30, 32 and 34°C and with relative humidity 80% at pick point. Ramping increase of temperature was 0.02 and for humidity it was 0.01. Day light was considered at maximum twelve hours a day because seedlings growth of this species depends largely on light availability. The study was conducted with heating the seedlings at day and night time both. Therefore, programming was done according to this context. Un-purified salt from salt bed of coastal areas of Chittagong district was collected and packed in vacuum packet to protect them from moisture intrusion. Solution of NaCl with water according to predetermined amount was irrigated to each seedling as treatment at every day. Data collected about the height, collar diameter and number of leaves of the seedlings recorded at every fourth day. After three months observation the data were analyzed. Growth data of height, collar diameter and leaf number were measured by subtracting final measurement with initial measurement during the observation. Statistical analysis: Statistical software used to analyze the growth measurements was Minitab 2002 version 13.2. Analysis of variance (ANOVA) was used to analyze both responses. Growing seedlings in a controlled Plant Growth Chamber and observing their performances is supported by different scientists.

Source of Information: Pakistan Journal of Biological Sciences, 16: 1765-1770; ISSN 1028-8880

Article Link (Online Journal): DOI: 10.3923/pjbs.2013.1765.1770; URL: http://scialert.net/abstract/?doi=pjbs.2013.1765.1770

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Climate change affects, raise in temperature and salinity intrusion in forest arenas may hamper their actual undisturbed growth. Elevated temperature has reported to be suitable for several species while some species tend to response negatively. Swietenia macrophylla is a common plantation species that grows all over the country. It has proved to be potential at future elevated atmospheric temperature condition. Nonetheless, this species might face a drastic situation at saline water intrusion in its plantation at their early stage of life. Therefore, plantations might be raised or planned in sites where there would be a salinity intrusion in near future. On the other hand, plantations might be raised in drier places facing or will face atmospheric temperature raise within 2050 or 2100.

Knowledge Management: Journal