TY - JOUR
T1 - N- and P-mediated seminal root elongation response in rice seedlings
AU - Ogawa, Satoshi
AU - Selvaraj, Michael Gomez
AU - Fernando, Angela Joseph
AU - Lorieux, Mathias
AU - Ishitani, Manabu
AU - McCouch, Susan
AU - Arbelaez, Juan David
PY - 2014/2/1
Y1 - 2014/2/1
N2 -
Aims: In rice, seminal root elongation plays an important role in acquisition of nutrients such as N and P, but the extent to which different N forms and P concentrations affect root growth is poorly understood. This study aimed to examine N- and P-mediated seminal root elongation response and to identify putative QTLs associated with seminal root elongation. Methods: Seminal root elongation was evaluated in 15 diverse wild and cultivated accessions of rice, along with 48 chromosome segment substitution lines (CSSLs) derived from a cross between the rice variety 'Curinga' and Oryza rufipogon (IRGC 105491). Root elongation in response to different forms of N (NH
4
+
, NO
3
-
and NH
4
NO
3
) and concentrations of P was evaluated under hydroponic conditions, and associated putative QTL regions were identified. Results: The CSSL parents had contrasting root responses to N and P. Root elongation in O. rufipogon was insensitive to N source and concentration, whereas Curinga was responsive. In contrast to N, seminal root elongation and P concentration was positively correlated. Three putative QTLs for seminal root elongation in response to N were detected on chromosome 1, and one QTL on chromosome 3 was associated with low P concentration. Conclusions: Genetic variation in seminal root elongation and plasticity of nutrient response may be appropriate targets for marker-assisted selection to improve rice nutrient acquisition efficiency.
AB -
Aims: In rice, seminal root elongation plays an important role in acquisition of nutrients such as N and P, but the extent to which different N forms and P concentrations affect root growth is poorly understood. This study aimed to examine N- and P-mediated seminal root elongation response and to identify putative QTLs associated with seminal root elongation. Methods: Seminal root elongation was evaluated in 15 diverse wild and cultivated accessions of rice, along with 48 chromosome segment substitution lines (CSSLs) derived from a cross between the rice variety 'Curinga' and Oryza rufipogon (IRGC 105491). Root elongation in response to different forms of N (NH
4
+
, NO
3
-
and NH
4
NO
3
) and concentrations of P was evaluated under hydroponic conditions, and associated putative QTL regions were identified. Results: The CSSL parents had contrasting root responses to N and P. Root elongation in O. rufipogon was insensitive to N source and concentration, whereas Curinga was responsive. In contrast to N, seminal root elongation and P concentration was positively correlated. Three putative QTLs for seminal root elongation in response to N were detected on chromosome 1, and one QTL on chromosome 3 was associated with low P concentration. Conclusions: Genetic variation in seminal root elongation and plasticity of nutrient response may be appropriate targets for marker-assisted selection to improve rice nutrient acquisition efficiency.
KW - Chromosome segment substitution lines
KW - N acquisition
KW - NH response
KW - Seminal root elongation
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U2 - 10.1007/s11104-013-1955-y
DO - 10.1007/s11104-013-1955-y
M3 - Article
AN - SCOPUS:84893713927
VL - 375
SP - 303
EP - 315
JO - Plant and Soil
JF - Plant and Soil
SN - 0032-079X
IS - 1-2
ER -