Skip navigation

Genotype by environment interactions in identifying cassava (Manihot esculenta Crantz) resistant to cassava brown streak disease

Genotype by environment interactions in identifying cassava (Manihot esculenta Crantz) resistant to cassava brown streak disease

Masinde, Emily A., Mkamillo, Geoffrey, Ogendo, Joshua O., Hillocks, Rory, Mulwa, Richard M. S., Kimata, Bernadetta and Maruthi, Midatharahally N. ORCID: 0000-0002-8060-866X (2017) Genotype by environment interactions in identifying cassava (Manihot esculenta Crantz) resistant to cassava brown streak disease. Field Crops Research, 215. pp. 39-48. ISSN 0378-4290 (Print), 1872-6852 (Online) (doi:https://doi.org/10.1016/j.fcr.2017.10.001)

[img]
Preview
PDF (Author Accepted Manuscript)
17795 MARUTHI_Genotype_By_Environment_Interactions_2017.pdf - Accepted Version

Download (738kB) | Preview
[img] PDF (Acceptance Email)
17795_MARUTHI_Acceptance_Email_2017.pdf - Additional Metadata
Restricted to Repository staff only

Download (181kB)

Abstract

Cassava landraces were evaluated for resistance to cassava brown streak disease (CBSD) for two cropping seasons at a disease hotspot area in Naliendele, Tanzania. Based on reactions to CBSD, several landraces including Chimaje, Mfaransa and Supa B were considered to be resistant to the disease while Kikwada, Mbuyu, and Nyoka were tolerant. ANOVA revealed that the largest sum of squares (SS) (41.9–86.7%) was attributed to the genotype of the cassava landraces, while a smaller proportion of SS (8.1–38.2%) was due to genotype by environment interactions for all traits tested, which included disease symptoms, root weight, number of roots per plant and dry matter content. Environment accounted for the smallest effect (0.01–26.3%), however, the mean squares was nonetheless significant for a few genotypes, which indicated that their disease expression was indeed influenced by the environment. Increased CBSD severity was associated with low temperatures and rainfall. Increased rainfall towards harvesting led to higher root weight but lower dry matter content in the first cropping season. Correlation analysis showed that the presence of CBSD symptoms reduces the amount of usable roots, total root weight, and root dry matter content. Many resistant/tolerant landraces also had high root weight and dry matter content, and they can be used by farmers to reduce CBSD losses. The landraces described here form novel sources of CBSD resistance that can be used for breeding disease-resistant cassava varieties with superior agronomic characteristics.

Item Type: Article
Uncontrolled Keywords: Cassava; Landraces; CBSD resistance; Genotype × environment interaction; Yield related traits
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Faculty of Engineering & Science > Natural Resources Institute > Plant Health Research Group
Last Modified: 01 May 2019 20:43
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: GREAT b
Selected for GREAT 2019: GREAT 5
URI: http://gala.gre.ac.uk/id/eprint/17795

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics