Table 3 Amount of P in the trichloroacetic acid-soluble reactive P (TCA P) and in the residual P pool derived from the labelling period [15–23 days after seeding (DAS)], from the non-labelling period, and the total amount of TCA P in each compartment

From: A dual isotopic approach using radioactive phosphorus and the isotopic composition of oxygen associated to phosphorus to understand plant reaction to a change in P nutrition

	Labelling period				Non-labelling period				Sum (0-33 DAS)
	mg P per compartment
	Roots	Stems	Old leaves	New leaves	Roots	Stems	Old leaves	New leaves	Roots	Stems	Old leaves	New leaves
TCA P
Control	17.6a	6.7a	12.5a	3.0a	6.9a	4.9a	5.8a	0.9a	24.5a	11.6a	18.3a	3.9a
+ P	10.9a	12.0a	9.3ab	6.3b	36.8b	26.9b	9.9a	17.2b	47.7b	38.9b	19.1a	23.5b
− P	9.8a	9.5a	3.0b	5.2ab	4.0a	4.5a	0.7b	2.2a	13.8c	14.0a	3.7b	7.4a
Pooled SD	4.6	3.3	3.7	1.4	10.6	11.1	4.3	13.5	3.9	4.2	4.0	4.2
Source of variation (p value)
Treatment	ns	ns	0.03	0.05	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	0.001	< 0.001
Residual P
Control	1.6a	0.9a	1.7a	1.0a	1.1a	0.9a	1.2a	0.5a	2.6a	1.8a	2.9a	1.5a
+ P	1.5a	2.5b	1.4a	2.5a	3.8b	5.1b	2.8a	4.4b	5.3b	7.7b	4.2a	6.8b
− P	2.4a	4.7c	1.5a	6.9b	1.2a	0.6a	0.5a	1.6ab	3.6a	5.2b	2.0a	8.5b
Pooled SD	0.6	0.3	0.2	0.5	0.9	0.9	1.9	3.0	1.4	1.0	1.4	2.1
Source of variation (p value)
Treatment	ns	< 0.001	ns	< 0.001	0.006	< 0.001	ns	0.05	0.1	< 0.001	ns	0.006

In the case of the control, the non-labelling period includes the first 15 days (0–15 DAS). In the case of the + P and − P, the non-labelling period represents the time from 0 to 15 DAS and from 23 to 33 DAS. Letters behind values indicate significant differences between the treatments within the same plant part based on a Tukey’s HSD test with α = 0.05

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ISSN: 1746-4811

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