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Section XIV : Plant Sciences 3
was carried out to obtain a comparative expression profiling of these 8 transcripts
between tolerant and susceptible cultivars, upon ToLCNDV infection. The expression
patterns of these transcripts showed a significant increase in differential
expression in the tolerant cultivar mostly at 14 dpi and 21 dpi in comparison to that
in the susceptible cultivar as analyzed by qRT-PCR. The present study reveals that
changes in host gene expression that occurred during ToLCNDV interaction were
associated with tolerant characteristics of the tolerant cultivar. A strong correlation
of siRNA accumulation with ToLCNDV tolerance was also observed in tolerant
cultivar. The probable direct and indirect relationship of siRNA accumulation and
up-regulated transcripts with ToLCNDV tolerance mechanism is discussed.
PROF. ARCHANA SHARMA MEMORIAL AWARD
Stem Cell Regulation and small RNA Mediated Organ
Patterning in Higher Plants
Ananda K. Sarkar
National Institute for Plant Genome Research (NIPGR),
Aruna Asaf Ali Marg,
New Delhi-110067
Keywords : Stemcell, RNA, mediation, organ, patterning, higher, plants
Higher plants continuously grow and produce organs throughout their life.
Fountain of their youth are two populations of stem cells residing at two ends of
a growing plant, the shoot meristem and root meristem. These ‘stem cell niches’
are established early in the embryogenesis. Aerial lateral organs, such as leaves,
are produce from the flank of the shoot meristem. Shoot meristem derived unknown
signal and classes of small RNAs regulate the initiation and patterning of developing
leaves. A genomic approach has identified global regulators of organ development.
Although apparently different, the root and shoot meristems possess conserved
stem cell regulatory mechanism. Development of root lateral organs is different
than shoot and is a promising area to study.