Stomatal conductance and photosynthesis

This research is part of an effort that the ICT (Institute of Tropical Cultivation) has been doing for several years tending to develop superior genotypes of cocoa (Theobroma cacao L.). That is why this study aims to find tolerant or moderately tolerant cocoa genotypes and accessions to water stress with resistance to pests and diseases and high production and industrial quality. Twenty genotypes of cocoa seedlings were investigated, during the period of 6 months, in a soil with sandy-loam texture under nursery conditions, of controlled irrigation. A split plot design was used, with 40 treatments and 3 repetitions. In addition, daily data of the micro climatic characteristics (T °, HR) were taken, in which different indicators of variable were evaluated such as the stomatal conductance (CE) that is greatly influenced by the T ° and HR. The results obtained indicate that the genotypes that showed moderate tolerance to water stress were UNG - 77, UNG - 53, ICT - 1281 and ICT - 1112; the non-tolerant ones were PAS - 93, CEPEC - 2002, ICT - 2142, ICT - 1092, CP - 2005 - C10, TSH - 1188, CCN - 51, IMC - 67, PH - 17, AYP - 15, ICS - 6, BN - 34, ICT - 1506, PAS - 91, PH - 990 and ICS - 1. Under optimal conditions, the most outstanding genotype was ICS-1, both in plant height, number of leaves, and stomatal conductance, this being proof that this genotype develops excellently and stands out if it has the right conditions and water availability.

[1]  G. Farquhar,et al.  Stomatal regulation and water economy in crassulacean acid metabolism plants: an optimization model , 1982 .

[2]  Graham D. Farquhar,et al.  Modelling of Photosynthetic Response to Environmental Conditions , 1982 .

[3]  J. Passioura Water in the Soil-Plant-Atmosphere Continuum , 1982 .

[4]  Graham D. Farquhar,et al.  On the Relationship Between Carbon Isotope Discrimination and the Intercellular Carbon Dioxide Concentration in Leaves , 1982 .

[5]  T. Sharkey,et al.  Effect of Light Quality on Stomatal Opening in Leaves of Xanthium strumarium L. , 1981, Plant physiology.

[6]  T. Sharkey,et al.  Separation and measurement of direct and indirect effects of light on stomata. , 1981, Plant physiology.

[7]  J. Bunce Comparative Responses of Leaf Conductance to Humidity in Single Attached Leaves , 1981 .

[8]  J. Manchester,et al.  Presence of Both Photosystems in Guard Cells of Vicia faba L: IMPLICATIONS FOR ENVIRONMENTAL SIGNAL PROCESSING. , 1981, Plant physiology.

[9]  A. Melis,et al.  Fluorescence Properties of Guard Cell Chloroplasts: EVIDENCE FOR LINEAR ELECTRON TRANSPORT AND LIGHT-HARVESTING PIGMENTS OF PHOTOSYSTEMS I AND II. , 1981, Plant physiology.

[10]  A. E. Hall,et al.  Stomatal response to environment and a possible interrelation between stomatal effects on transpiration and CO2 assimilation , 1980 .

[11]  M. Tyree,et al.  The site of water evaporation from sub-stomatal cavities, liquid path resistances and hydroactive stomatal closure. , 1980 .

[12]  D. Walton Biochemistry and physiology of abscisic acid. , 1980 .

[13]  J. Passioura The Transport of Water from Soil to Shoot in Wheat Seedlings , 1980 .

[14]  Graham D. Farquhar,et al.  Responses to Humidity by Stomata of Nicotiana glauca L. And Corylus avellana L. Are Consistent With the Optimization of Carbon Dioxide Uptake With Respect to Water Loss , 1980 .

[15]  I. R. Cowan,et al.  Stomatal conductance correlates with photosynthetic capacity , 1979, Nature.

[16]  S. Larsson,et al.  Effects of Kinetin on Transpiration Rate and Abscisic Acid Content of Water Stressed Young Wheat Plants , 1979 .

[17]  P. Nobel,et al.  Effect of Water Stress on the Temperature Optima of Net CO2 Exchange for Two Desert Species , 1978 .

[18]  I. R. Cowan,et al.  Leaf Conductance in Relation to Assimilation in Eucalyptus pauciflora Sieb. ex Spreng: Influence of Irradiance and Partial Pressure of Carbon Dioxide. , 1978, Plant physiology.

[19]  G. Farquhar,et al.  Effect of abscisic Acid on the gain of the feedback loop involving carbon dioxide and stomata. , 1978, Plant physiology.

[20]  G. Farquhar,et al.  Gain of the feedback loop involving carbon dioxide and stomata: theory and measurement. , 1978, Plant physiology.

[21]  G. Farquhar,et al.  On the Resistance to Transpiration of the Sites of Evaporation within the Leaf. , 1978, Plant physiology.

[22]  J. O’toole,et al.  Photosynthetic Response to Water Stress in Phaseolus vulgaris , 1977 .

[23]  E. Zeiger,et al.  Light and Stomatal Function: Blue Light Stimulates Swelling of Guard Cell Protoplasts , 1977, Science.

[24]  B. Loveys The Intracellular Location of Abscisic Acid in Stressed and Non‐Stressed Leaf Tissue , 1977 .

[25]  Richard H. Rand,et al.  Gaseous Diffusion in the Leaf Interior , 1977 .

[26]  Barbara G. Pickard,et al.  Mediation of rapid electrical, metabolic, transpirational, and photosynthetic changes by factors released from wounds. III. Measurements of CO2 and H2O flux , 1976 .

[27]  H. Woolhouse,et al.  TEMPERATURE ON PHOTOSYNTHESIS AND TRANSPIRATION IN POPULATIONS OF SESLERIA CAERULEA (L) ARD. , 1976 .

[28]  H. Jones Crop Characteristics and the Ratio Between Assimilation and Transpiration , 1976 .

[29]  H. Meidner Water supply, evaporation, and vapour diffusion in leaves , 1975 .

[30]  P. Jarman The Diffusion of Carbon Dioxide and Water Vapour through Stomata , 1974 .

[31]  B. Drake,et al.  Prechilling of Xanthium strumarium L. Reduces Net Photosynthesis and, Independently, Stomatal Conductance, While Sensitizing the Stomata to CO(2). , 1974, Plant physiology.

[32]  H. Jones LIMITING FACTORS IN PHOTOSYNTHESIS , 1973 .

[33]  T. Hsiao,et al.  Action Spectra for Guard Cell Rb Uptake and Stomatal Opening in Vivia faba. , 1973, Plant physiology.

[34]  S. W. Thorne,et al.  Effect of light intensity during growth of Atriplex patula on the capacity of photosynthetic reactions, chloroplast components and structure , 1972 .

[35]  R. Horton Stomatal opening: the role of abscisic acid , 1971 .

[36]  R. Slatyer,et al.  Plant Water Status, Leaf Temperature, and the Calculated Mesophyll Resistance to Carbon Dioxide of Cotton Leaves , 1969 .

[37]  P. Kuiper,et al.  Dependence upon Wavelength of Stomatal Movement in Epidermal Tissue of Senecio odoris. , 1964, Plant physiology.

[38]  S. L. Rawlins,et al.  Concentration of Carbon Dioxide inside Leaves , 1963, Nature.

[39]  J. Monteith CHAPTER 7 – Gas Exchange in Plant Communities , 1963 .

[40]  H. L. Penman,et al.  Some physical aspects of assimilation and transpiration , 1951 .

[41]  G. W. Scarth,et al.  MECHANISM OF THE ACTION OF LIGHT AND OTHER FACTORS ON STOMATAL MOVEMENT. , 1932, Plant physiology.