Comparison of the S-, N- or P-Deprivations’ Impacts on Stomatal Conductance, Transpiration and Photosynthetic Rate of Young Maize Leaves

Abstract

Seven-day-old maize (Zea mays) plants were grown hydroponically for ten days in deprived nutrient solutions against the corresponding control grown under full nutrition; the effects of S-, N-or P-deprivation on laminas' mean stomatal conductance (g s ), transpiration rate (E) and photosynthetic rate (A) were monitored, along with the impact on the laminas' total dry mass (DM), water amount (W), length and surface area (S a ). Furthermore, a time series analysis of each parameter's response ratios (Rr), i.e. the treatment's value divided by the corresponding control's one, was performed. Under S-deprivation, the Rr of laminas' mean g s , E, and A presented oscillations within a ±15% fluctuation zone, notably the "control" zone, whilst those of laminas' total DM, water amount, surface area, and length included oscillation during the first days and deviation later on, presenting deviation during d10. Under the N-deprivation conditions all Rr time courses except the A one, included early deviations from the control zone without recovering. The deviation from the control zone appeared at d4. Under P-deprivation, all Rr time courses represented oscillations within the control zone. P-deprivation's patterns resembled those of S-deprivation. Compared to the one of the S-deprivation, the P-one's oscillations took place within a broader zone. Linear relationships among the various Rr patterns were found between g s -E, g s -A, E-A, DM-W and DM-S a . In conclusion, the impact of P-deprivation appeared in an early stage and included an alleviation action, the one of N-deprivation appeared early with no alleviation action, whilst that of S-deprivation appeared later, being rather weaker when compared to the impact of the P-deprivation's impact.

New insights into trophic aerenchyma formation strategy in maize (Zea mays L.) organs during sulfate deprivation

“…We also know that the central bundle of the second LA under sulfate deprivation is more robust than that of control and lignification has been stimulated, obviously to mechanically support the aerenchymatous tissues ( Bouranis et al, 2007a ). In a previous work where the impact of sulfate deprivation on stomatal conductance, transpiration rate, and photosynthetic rate were examined, the LA’s surface area was not found to be increased at d10 ( Bouranis et al, 2012 ). The plants were receiving 170 μmol photons m -2 ⋅s -1 PPFD, whilst in this work the photon flux was adjusted to 250 μmol photons m -2 ⋅s -1 .…”

Distribution Profiles and Interrelations of Stomatal Conductance, Transpiration Rate and Water Dynamics in Young Maize Laminas under Nitrogen Deprivation

“…In a previous work, the fluctuations of the laminas mean stomatal conductance, transpiration rate, and photosynthetic rate, along with the fluctuations on the laminas total dry mass, water amount, length and surface area, as well as their responses to nitrate deprivation have been reported [10]. The approach focused on the time series analysis of the response ratios (Rr), i.e.…”