Agriculture Reference
In-Depth Information
Tolerance to abiotic stress was observed for over production
of proline. Proline seems to have diverse roles under osmotic
stress conditions, such as stabilization of proteins, membranes
and subcellular structures, and protecting cellular functions by
scavenging reactive oxygen species (Kishor et al. 2005).
Endosperm protein of rice during seed development
confi rmed that storage protein begins to accumulate about 5
days after fl owering. Two polypeptide groups, 22 to 23 and
37 to 39 KDa, the components of glutelin, the major storage
protein in rice seed, appeared 5 days after fl owering. A 26 KDa
polypeptide, the globulin component, also appeared 5 days
after fl owering. Smaller peptides (10 to 16 KDa) including
prolamin components, appeared about 10 days after fl owering.
In contrast, the levels of the 76 and 57 KDa polypeptides were
fairly constant throughout seed development, the accumulation
of glutelin and globulin, was found faster than accumulation
of prolamin (Yamagata et al. 1982).
Protein
Days after fl owering
Glutelin
5
Globulin
5
Prolamin 10
It is also noted that the levels of fertilizer application in the
cultivation infl uenced the protein and amylose contents in rice
varieties appreciably. In an experiment with six rice cultivars
it is observed that high fertilizer enhanced signifi cantly the
protein content, in some varieties it had been doubled, on the
other hand amylose content decreased signifi cantly. Thus,
there is a negative correlationship between grain protein and
amylose content. IR71137-243 has high protein content and
IR72 has high amylose content (Table 19).
