| dc.description.abstract | Soybean needs increased yearly along with the increasing population. The
national product has not meet the domestic needs, so that the rest was fulfilled by
import. Soybean plants classified in the leguminoseae family which is a C
plant.
As a C
plant, soybean has low photosynthetic efficiency particularly when it is
exposed to high radiation and air temperature. This efficiency could be improved
using biotechnology of forming association between soybean and Synechococcus
sp. bacteria, a photosynthetic bacteria. Previous studies proved that the presence
of bacteria Synechococcus sp. on leaf surfaces improved plant photosynthetic
attributes, such as mesophyll thickness, cholorophyll content, and stomatal
conductance. Growth of soybean plants is divided into two major phases,
vegetative and generative phases. Each phase of growth has unique physiological
stage of plant development and each stage has different characters. Therefore, the
effect of Synechococcus sp. bacteria innoculation should different on each critical
growth stage of soybean.
3
The objective of this research was to study the effect of Synechococcus sp.
bacteria innoculation on the rate of photosynthesis of soybean. To address this
objective, the research was conducted based on randomized complete design with
5 levels of treatments, namely control that is plant without Synechococcus sp
bacteria innoculation (P0), Synechococcus sp. bacteria innoculated once at flower
inisiation stage (P1), Synechococcus sp bacteria innoculated twice, ie at vegetatife
exponential growth and flower inisiation stages (P2), Synechococcus sp. bacteria
innoculated three times, ie at flower inisiation and pod formation stages (P3),
Synechococcus sp. bacteria innoculated twice, ie at vegetatife exponential growth,
flower inisiation and pod formation stages (P4). Each treatment was replicated ten
times.
Observation as focused on photosynthetic rate (Fv/Fm), the number of
leaves per plant, leaf chlorophyll content (µmol/m
8
2
), stomatal conductance (mmol
H
2
O/m
2
/s), leaf area index, plant height (cm), the number of branches, weight of
100 seeds (g), seed weight per plant (g), the number of seeds per plant. Collected
data then was analyzed with the value of SEM (Standard Error of the Mean).
The results showed that innoculation of Synechococcus sp. bacteria at
flower inisiation stage increases the photosynthetic rate of soybean by 17.52%,
that leads to increase soybean seed production by 40.68%. | en_US |
