Effect of varied soil moisture regimes on the growth and reproduction of two Australian biotypes of junglerice (Echinochloa colona)
2019
Junglerice [Echinochloa colona (L.) Link] is a problematic weed in the northern grain region of
Australia. Two pot experiments (Experiment 1 and Experiment 2) were conducted in a screen
house to evaluate the growth and reproductive behavior of two biotypes (A, collected from a
cotton (Gossypium hirsutum L.)–fallow; B, collected from a fence near a water channel) of
E. colona in response to water stress (100%, 75%, 50%, and 25% water holding capacity
[WHC]). Averaged across both biotypes, the plant height, biomass, and seed production of
E. colona were reduced at 25% WHC compared with 100% WHC. However, E. colona still
produced a considerable amount of seeds at 25% WHC (at least 365 seeds plant−1
). Biotype
A produced more seeds in the second experiment, while biotype B produced more seeds in
the first experiment. In Experiment 2, at 100% WHC, biotype A produced more seeds
(17,618 seeds plant−1
) than biotype B (4,378 seeds plant−1
), and similar observations were
noticed for root biomass. Growth and seed production of E. colona at all moisture levels
and environmental conditions ensure survival in an unpredictable environment and contribute
to the weedy nature of this species. Results indicate that biotype A is more invasive than biotype
B under favorable environmental conditions (100% WHC). This study suggests an enhanced
competitive ability of some biotypes of E. colona in response to a range of environmental and
soil moisture conditions in Australia. Under favorable environmental conditions, biotype A
could be more problematic, as it has higher seed production than biotype B. Therefore, it is
important to implement sustainable weed control methods for such biotypes in the early stages
of crop growth to prevent loss of stored moisture.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
35
References
5
Citations
NaN
KQI