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Genetic variation in pea (Pisum sativum L.) demonstrates the importance of root but not shoot C/N ratios in the control of plant morphology and reveals a unique relationship between shoot length and nodulation intensity

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Title Genetic variation in pea (Pisum sativum L.) demonstrates
the importance of root but not shoot C/N ratios in the
control of plant morphology and reveals a unique
relationship between shoot length and nodulation intensity
 
Creator Ludidi , N N
Pellny, T K
Kiddle, G
Dutilleul, C
Gropten, K
Heerden, PDR Van
Dutt, Som
Powers, S J
Foyer, C H
 
Subject Nutraceuticals
 
Description Nodule numbers are regulated through systemic autoregulatory
signals produced by shoots and roots. The relative
effects of shoot and root genotype on nodule numbers
together with relationships to organ biomass, carbon (C)
and nitrogen (N) status, and related parameters were measured
in pea (Pisum sativum) exploiting natural genetic
variation in maturity and apparent nodulation intensity.
Reciprocal grafting experiments between the early (Athos),
intermediate (Phönix) and late (S00182) maturity phenotypes
were performed and Pearson’s correlation coefficients
for the parameters were calculated. No significant
correlations were found between shoot C/N ratios and plant
morphology parameters, but the root C/N ratio showed a
strong correlation with root fresh and dry weights as well as
with shoot fresh weight with less significant interactions
with leaf number. Hence, the root C/N ratio rather than
shoot C/N had a predominant influence on plant morphology
when pea plants are grown under conditions of symbiotic
nitrogen supply.The only phenotypic characteristic that
showed a statistically significant correlation with nodulation
intensity was shoot length, which accounted for 68.5% of
the variation. A strong linear relationship was demonstrated
between shoot length and nodule numbers. Hence,
pea nodule numbers are controlled by factors related to
shoot extension, but not by shoot or root biomass accumulation,
total C or total N. The relationship between shoot
length and nodule numbers persisted under field conditions.
These results suggest that stem height could be used
as a breeding marker for the selection of pea cultivars with
high nodule numbers and high seed N contents.
 
Date 2007
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://ihbt.csircentral.net/521/1/378_2007_2-12-2011.pdf
Ludidi , N N and Pellny, T K and Kiddle, G and Dutilleul, C and Gropten, K and Heerden, PDR Van and Dutt, Som and Powers, S J and Foyer, C H (2007) Genetic variation in pea (Pisum sativum L.) demonstrates the importance of root but not shoot C/N ratios in the control of plant morphology and reveals a unique relationship between shoot length and nodulation intensity. Plant Cell and Environment, 30. pp. 1256-1268.
 
Relation http://ihbt.csircentral.net/521/