Table 2.

Phenotypic correlation coefficients among root traits and P content, biomass and yield traits of 106 RILs in the field under different P levels

P level	Trait	PPC	SPC	PDW	SDW	SN	SW
LP	RL	0·43**	0·56**	0·47**	0·55**	0·44**	0·46**
	RSA	0·59**	0·70**	0·65**	0·70**	0·47**	0·47**
	RW	0·56**	0·62**	0·62**	0·63**	0·46**	0·43**
	RRS	−0·21**	−0·03	−0·17	−0·04	0·32**	0·32**
	RDW	0·67**	0·80**	0·74**	0·81**	0·53**	0·51**
	RPC	0·70**	0·87**	0·76**	0·82**	0·51**	0·49**
HP	RL	0·38**	0·55**	0·44**	0·56**	0·22*	0·25*
	RSA	0·59**	0·73**	0·65**	0·73**	0·37**	0·29**
	RW	0·43**	0·43**	0·44**	0·43**	0·08	0·21*
	RRS	0·09	0·28**	0·14	0·24*	0·21**	0·11
	RDW	0·74**	0·83**	0·80**	0·82**	0·40**	0·34**
	RPC	0·71**	0·90**	0·73**	0·80**	0·32**	0·26**

Asterisks indicate significant at *5 % level of probability, **1 % level of probability. RL, total root length; RSA, total root surface area; RW, root width; RRS, ratio of root/shoot; RDW, root dry weight; RPC, root P content; PPC, plant P content; SPC, shoot P content; PDW, plant dry weight; SDW, shoot dry weight; SN, seed number per plant; SW, seed weight per plant.