Physiological and biochemical response of maize to drought stress

UNSPECIFIED (2011) Physiological and biochemical response of maize to drought stress. Universiti Malaysia Sabah. (Unpublished)

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Abstract

This study aims to assess the physiological and biochemical changes of maize during water stress condition. Methodologically, Yellow Super Sweet Corn (YSC) and Thai Super Sweet Corn (TSC) were conducted with water stress condition in different days of interval for watering. The leaves sample were collected and determined for both physiological and biochemical parameters responses to drought stress. The determined physiological parameters were plant height, leaf area, leaf water potential, photsynthesis rate, transpiration rate and weight and length of cob. The measured biochemical parameters were proline content, protein conten, MDA content, chlorophyll content and membrane stability index (MSI). The finding shows that increasing water stress siginificantly reduced the physiological and biochemical parameters as compared to control treatment which is watering everyday. Plant height and leaf area in maize treated with T2 were the highest (68.7 cm for YSC and 53 cm for TSC) among water stress treatments particularly leaf area of maize in T2 (84 cm² for YSC and 76 cm² for TSC) was found that no significant differences as compared to control treatment. Photosynthesis rate and transpiration rate were significantly reduced along with the increasing water stress period. Maize cob still can be produced in T2 treatment which is three days interval of watering. For biochemical studies, the experiment show that proline accumulated highest in YSC treated with T4 (3.8 x 10�³ mg mL�¹ in 200 mg of leaves) at day 65 and TSC which treated with T5 (0.08 mg mL�¹ in 200 mg of leaves) at day 40. Protein content in YSC treated with T2 (5.6 x10�� mg mL�¹ ) was found that no significant differences with control treatment but showed differences in TSC which treated with same treatment (3.3 x 10�� mg mL�¹) at day 65. There was no significant differences in chlorophyll content between maize treated with T2 and control treatment. MDA content was find that highest accumulation in YSC treated with T3 and T4 which are 0.95 µmol in 100 mg leaves and also in TSC treated with T3 which is 0.64 µmol in 100 mg leaves at the day 65. MSI was reduced in water stress treatments such as YSC treated with T3 and T4 as well as TSC treated with T2 and T3 at day 65. This study found that the three days interval of watering (n) had the similar result as compared to everyday watering treatment (T1) and be able to produce maize cob at the day 65.

Item Type: Academic Exercise
Uncontrolled Keywords: maize, water stress condition, physiological changes, biochemical changes
Subjects: S Agriculture > SB Plant culture
Divisions: FACULTY > Faculty of Sustainable Agriculture
Depositing User: Users 83 not found.
Date Deposited: 06 Jun 2017 03:36
Last Modified: 13 Oct 2017 06:25
URI: http://eprints.ums.edu.my/id/eprint/17056

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