Table III.

In situ fluorescence characteristics of varieties IR72 and IR65600-42-5-2 (NPT) plants in LL, ML, and HL conditions (10%, 40%, and 100% of full sunlight, respectively)

Variety and Growth Condition	Fv/Fm	qP	Φ PSII
IR72
LL	0.805 ±  0.002	0.884 ±  0.016	0.707 ±  0.013
ML	0.765 ±  0.003	0.607 ±  0.047	0.424 ±  0.024
HL	0.752 ±  0.005	0.461 ±  0.025	0.255 ±  0.013
NPT
LL	0.803 ±  0.002	0.923 ±  0.022	0.711 ±  0.025
ML	0.773 ±  0.002	0.714 ±  0.025	0.468 ±  0.013
HL	0.736 ±  0.003	0.519 ±  0.015	0.268 ±  0.015

Measurements were taken during mid-morning and midafternoon when incident irradiance was greatest (as dictated by the upright leaf posture). F_v/F_m was measured following a 10-min dark adaptation period. qP and quantum yield of PSII reaction centers (ΦPSII) were calculated as described in the text. Values represent means of measurements taken over a 2- to 3-d period ± se, n > 20.