Biological characteristics of UPLB Azolla hybrids for irrigated lowland rice

Issue Date

6-2017

Abstract

Rapid growth and year-round spore production are the biological characteristics of Azolla found to fit some requirements as green manure for irrigated lowland rice. The Biology and Culture Team of the National Azolla Action Program developed hybrids through in-vitro technique to produce superior Azolla hybrids. Among the 46 Azolla hybrids, 10 were identified as prolific spore producers under greenhouse condition in Los Baños, Laguna. With the objective to produce genetically-improved Azolla varieties for irrigated lowland rice, these hybrids were used to set parameters that can be used as criteria for the desired traits in the selection of Azolla. Estimating growth rate using linear model was determined as a more appropriate method to be used to compare the vegetative growth of Azolla. Azolla varieties recommended should sporulate for at least 50% in a year with S1 greater than or equal to 50% during maximum sporulation. Azolla mexicana No. 2033 has the fastest growth followed by A. mexicana No. 2024 and A. microphylla No. 4124, respectively. When the Azolla hybrids were incubated at 36 deg C floodwater temperature for 10 days, there is a significant reduction in the growth rates of 10 hybrids. The Azolla hybrids highly affected during the incubation are the A. microphylla No. 4119 and Azolla microphylla No. 4114 which already underwent senescence at Day 8. The spore production of these Azolla hybrids differ. A. microphylla No. 4099, A. microphylla No. 4113 and A. microphylla No. 4098 produced spore year round and with the highest peak of spore production (S1 greater than or equal to 50%) among other hybrids. Among the 10 Azolla UPLB hybrids evaluated. Azolla microphylla 4099, A. microphylla 4113, A. microphylla 4098, A. mexicana 2033 and A. mexicana 2030 are the best varieties to be selected in rice areas with similar environmental conditions and crop management practices with Los Baños Laguna [Philippines].

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463X

Volume

42

Issue

Supplement no. 1

Page

94-95

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Language

English

Subject

Hybrid rice;

En – AGROVOC descriptors

AZOLLA; HYBRIDS; ORYZA SATIVA; SELECTION; IRRIGATED LAND; LOWLAND; GROWTH

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