A method to evaluate the genetic control of plant response to increasing soil water deficit is proposed. A description of single tree transpiration behavior was obtained considering parameters independent from air and soil conditions. We removed environmental effects by using two approaches: the normalization of drought data to control (watered) plants and the fitting of a process model. We analyzed the transpiration of 475 4-year-old European beech seedlings, belonging to eight full-sib families. Approximately, one-third of the seedlings were kept in well-watered conditions while the others were exposed to drought for 14 days. Daily plant transpiration was estimated as the difference between two subsequent gravimetric measurements. A mechanistic model was fitted to transpiration data separately for each tree. In the model, the relationship of transpiration with vapor pressure deficit and soil water deficit of each tree is modulated by three parameters: maximum leaf conductance (gMl ), maximum transpiration in well-watered soil conditions ðEM0 l Þ and a parameter describing stomatal sensitivity to soil water deficit (c). The model successfully fitted most single tree data and a distribution of estimates for the three parameters (gMl , EM0 and c) was obtained. Predicted transpiration values were in good agreement with observed data (R2 = 0.86). The model approach produced parameters significantly correlated with those of the ‘‘normalization to control’’ approach. Estimated parameters vary considerably among trees, suggesting the presence of individual differences in stomatal behavior and response to drought. In spite of a large among tree (within family) variation, the among families component for gMl , EM0 l and c explained 9.5, 3.3 and 0.1% of total parameters variation suggesting a significant genetic control of transpiration processes.

A simple general method to evaluate intra-specific transpiration parameters within and among seedling families / Leonardi, Stefano; Piovani, P; Magnani, F; Menozzi, Paolo. - In: OECOLOGIA. - ISSN 0029-8549. - 149:(2006), pp. 185-193. [10.1007/s00442-006-0427-y]

A simple general method to evaluate intra-specific transpiration parameters within and among seedling families

LEONARDI, Stefano;MENOZZI, Paolo
2006-01-01

Abstract

A method to evaluate the genetic control of plant response to increasing soil water deficit is proposed. A description of single tree transpiration behavior was obtained considering parameters independent from air and soil conditions. We removed environmental effects by using two approaches: the normalization of drought data to control (watered) plants and the fitting of a process model. We analyzed the transpiration of 475 4-year-old European beech seedlings, belonging to eight full-sib families. Approximately, one-third of the seedlings were kept in well-watered conditions while the others were exposed to drought for 14 days. Daily plant transpiration was estimated as the difference between two subsequent gravimetric measurements. A mechanistic model was fitted to transpiration data separately for each tree. In the model, the relationship of transpiration with vapor pressure deficit and soil water deficit of each tree is modulated by three parameters: maximum leaf conductance (gMl ), maximum transpiration in well-watered soil conditions ðEM0 l Þ and a parameter describing stomatal sensitivity to soil water deficit (c). The model successfully fitted most single tree data and a distribution of estimates for the three parameters (gMl , EM0 and c) was obtained. Predicted transpiration values were in good agreement with observed data (R2 = 0.86). The model approach produced parameters significantly correlated with those of the ‘‘normalization to control’’ approach. Estimated parameters vary considerably among trees, suggesting the presence of individual differences in stomatal behavior and response to drought. In spite of a large among tree (within family) variation, the among families component for gMl , EM0 l and c explained 9.5, 3.3 and 0.1% of total parameters variation suggesting a significant genetic control of transpiration processes.
A simple general method to evaluate intra-specific transpiration parameters within and among seedling families / Leonardi, Stefano; Piovani, P; Magnani, F; Menozzi, Paolo. - In: OECOLOGIA. - ISSN 0029-8549. - 149:(2006), pp. 185-193. [10.1007/s00442-006-0427-y]
File in questo prodotto:
File Dimensione Formato  
Oecologia_2006.pdf

non disponibili

Tipologia: Altro materiale allegato
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 457.37 kB
Formato Adobe PDF
457.37 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1508427
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 7
social impact