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Resistance of soybeans to root-knot nematodes / by Avelina P. Rodil

By:

Rodil, Avelina P [author]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1978. Cavite State University- Main Campus,Description: 36 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

635.655 R61 1978

Online resources:

Click here to view thesis abstract and table of contents

Abstract: Rodil, Avelina, P., University of the Philippines at Los Banos, March, 1978. Resistance in Soybeans to Root-Knot Nematodes. Major Professor: Dr. Manolo B. Castillo Twenty-eight soybean varieties were found resistant to mixed cultures of M. incognita, M. acrita, M. arenaria, and M. javanica. The resistance of Strain #12, Strain #15, Strain #78, Strain #99, Tainung #3, Tainung #4, K 475, L114, and TY #5 to each of M. incognita, MV. arenaria and M. javanica was manifested at the 25- and 50- egg mass inoculum levels/pot. Resistance generally consisted of reduced gall formations, numbers of nematode recoveries from roots and soil and numbers of eggs/egg mass. Percentage yield reductions were also lower in resistant varieties than in susceptible Clark 63, although not necessarily shown by statistical analyses. Root and top weights of resistant varieties were either not affected, reduced or increased by nematode inoculations, depending on nematode Species and soybean varieties. Based on susceptibility ratings, determined from infection, reproduction and yield reduction indices, rankings in terms of resistance generally varied with inoculum level and nematode species. This suggested the differences in critical levels among resistant varieties and in host specificities among nematode species. Unlike in Clark 68, infection, reproduction and yield reduction indices were not directly related in resistant varieties, indicating that the varieties were not necessarily resistant to particular nematode species for the same reason.

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	635.655 R61 1978 (Browse shelf(Opens below))		Link to resource	Room use only	T-1111		00006158

Thesis (M. S.--Plant Pathology) University of the Philippines

Includes bibliographical references.

Rodil, Avelina, P., University of the Philippines at Los Banos, March, 1978. Resistance in Soybeans to Root-Knot Nematodes. Major Professor: Dr. Manolo B. Castillo

Twenty-eight soybean varieties were found resistant to mixed cultures of M. incognita, M. acrita, M. arenaria, and M. javanica. The resistance of Strain #12, Strain #15, Strain #78, Strain #99, Tainung #3, Tainung #4, K 475, L114, and TY #5 to each of M. incognita, MV. arenaria and M. javanica was manifested at the 25- and 50- egg mass inoculum levels/pot. Resistance generally consisted of reduced gall formations, numbers of nematode recoveries from roots and soil and numbers of eggs/egg mass. Percentage yield reductions were also lower in resistant varieties than in susceptible Clark 63, although not necessarily shown by statistical analyses. Root and top weights of resistant varieties were either not affected, reduced or increased by nematode inoculations, depending on nematode Species and soybean varieties.

Based on susceptibility ratings, determined from infection, reproduction and yield reduction indices, rankings in terms of resistance generally varied with inoculum level and nematode species.

This suggested the differences in critical levels among resistant varieties and in host specificities among nematode species. Unlike in Clark 68, infection, reproduction and yield reduction indices were not directly related in resistant varieties, indicating that the varieties were not necessarily resistant to particular nematode species for the same reason.

Submitted to the University Library 05/09/2007 T-1111