YIELD COMPONENTS AND GAS EXCHANGE RESPONSES OF NERICA RICE VARIETIES (Oryza sativa L.) TO VEGETATIVE AND REPRODUCTIVE STAGE WATER DEFICIT

SIKUKU PHOEBE

YIELD COMPONENTS AND GAS EXCHANGE RESPONSES OF NERICA RICE VARIETIES (Oryza sativa L.) TO VEGETATIVE AND REPRODUCTIVE STAGE WATER DEFICIT

SIKUKU PHOEBE * §

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§ Maseno University, Maseno, Kenya

YIELD COMPONENTS AND GAS EXCHANGE RESPONSES OF NERICA RICE VARIETIES (Oryza sativa L.) TO VEGETATIVE AND REPRODUCTIVE STAGE WATER DEFICIT

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Abstract

Kenya has got a rapidly increasing population which was estimated to be 36 million in the year 2009 with a growth rate of 2.7 per annum hence the need for diversified food production. Water deficit is one of the most environmental stresses affecting agriculture productivity. Drought may affect crop yield and gas exchange at any developmental stage while early reproductive stage is found to be one of the most susceptible phases of a crop to drought stress. NERICA (New Rice for Africa) are high yielding rainfed rice varieties with early maturity and has shown high potential to revolutionize rice farming even in Africa’s stress afflicted ecologies. However, NERICA varieties vary in their response to water deficit. A pot experiment was conducted in 2009 at the Maseno University Botanic garden, to evaluate the responses of five NERICA varieties (NERICA1, NERICA 2, NERICA 3, NERICA 4 and NERICA 5) to water deficit during their vegetative or reproductive stage of their development. The response pattern of crop yield and gas exchange parameters to water deficit imposed at different growth stages might provide basis for selecting the most tolerant variety to water deficit in order to stabilize yield and solve food crisis. The treatments were; T1- irrigating the pots with a litre of water after every two days (Control), T2 -water deficit at vegetative stage in which water was withheld by irrigating the plants using one litre of water after every six days from 30-50 days after planting; T3-water deficit at reproductive stage in which water was withheld by irrigating the plants using one litre of water after every six days from 51-71 days after planting. Water deficit caused a significant reduction in gas exchange parameters and yield more at the reproductive stage as compared to water deficit at vegetative stage. The results indicate that NERICA 2 and 4 were tolerant as compared to NERICA 1, 3 and 5 to water deficit occurring at vegetative stage or reproductive stage because

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

SIKUKU PHOEBE. 2012. "YIELD COMPONENTS AND GAS EXCHANGE RESPONSES OF NERICA RICE VARIETIES (Oryza sativa L.) TO VEGETATIVE AND REPRODUCTIVE STAGE WATER DEFICIT". Global Journal of Science Frontier Research, Global Journal of Science Frontier Research - D: Agriculture & Veterinary GJSFR-D Volume 12 (GJSFR Volume 12 Issue D3).

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GJSFR Volume 12 Issue D3

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Journal Specifications

Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

Keywords

flowering and yield NERICA rice Photosynthesis relative water content stomatal conductance transpiration

Classification

GJSFR-D Classification FOR Code: 820402

620103

Submission ReceivedJanuary 27, 2012
Peer Review Double Blind
Handling Editor
Accepted February 21, 2012
Published March 2, 2012

Version of record

v1.2

Issue date

March 17, 2012

Language

English

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Article Matrices

Total Score: 152

Country: Kenya

Subject: Global Journal of Science Frontier Research

Authors: Dr. Sikuku P.A., Onyango J.C., Netondo G.W. (PhD/Dr. count: 1)

View Count (all-time): 312

Total Views (Real + Logic): 1970

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Publish Date: 2012 03, Fri

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Total Views: 2K

Total Downloads: 90

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