Home About Browse Search
Svenska


Karlström, Amanda, 2015. Evaluation of the effects of the waxy starch mutation and environment on yield and starch functional properties of cassava. Second cycle, A2E. Alnarp: SLU, Department of Plant Breeding (from 130101)

[img]
Preview
PDF
1MB

Abstract

Cassava roots are one of the most important sources of starch on a global scale. Two
aspects of cassava as a starch crop were studied in this thesis work; 1) determining if
the amylose-free (waxy) mutation is coupled with a reduction in yield, and 2) the
environmental impact on yield, yield components and starch functional properties of
cassava. The waxy trait, resulting from a mutation in the GBSS locus, is in several
other crops associated with a yield penalty. In this study, siblings from eight full-sibling
families, segregating for the waxy trait, were used to determine if the waxy mutation
has implications for yield, dry matter content and harvest index in cassava. The only
significant effect of starch type was on the dry matter content, with the waxy clones
having a 0.8% lower dry matter than their wild type siblings. The environmental effects
on cassava yield and starch functional properties were examined by comparing data
from two contrasting environments of Colombia; the Cauca river valley and the
Caribbean coast. Significant differences were found in yield, dry matter content and
harvest index between cassava clones from different environments. There were
significant effects of environment on starch pasting properties, solubility and dispersed
volume fraction. Starches from the higher temperature, Caribbean coast had an
elevated pasting temperature (5°C higher for waxy starches and 3.6° C for wild type),
whereas the peak viscosity was lower in starches from this environment (114 cP lower
in waxy starch and 205 cP in wild type). The gravimetric method for determining dry
matter content in cassava roots was also evaluated.

Main title:Evaluation of the effects of the waxy starch mutation and environment on yield and starch functional properties of cassava
Authors:Karlström, Amanda
Supervisor:Geleta Dida, Mulatu and Ceballos, Hernán
Examiner:Bryngelsson, Tomas
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2015
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:LY003 Horticultural Science Programme 300 HEC
Department:(LTJ, LTV) > Department of Plant Breeding (from 130101)
Keywords:cassava, environment, functional properties, starch, yield penalty, waxy
URN:NBN:urn:nbn:se:slu:epsilon-s-4977
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-4977
Subjects:Plant physiology - Growth and development
Life sciences
Language:English
Deposited On:17 Nov 2015 15:16
Metadata Last Modified:17 Nov 2015 15:16

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits