DroughtStress {gpk}

Modeling Genotypic variation in photosynthetic competence of Sorghum bicolor

Description

Agriculture is the main source of income for nearly half of the Indian population. Most agriculture depends on monsoon rainfall. Hence results are uncertain. In years of drought, crops are often completely wiped out. It is therefore of great interest to identify crop varieties that can give at least some yield, even when faced with drought. That is why study of drought tolerance is very important. It is of course possible to try different varieties under various conditions of water shortage and compare results. Another possibility is to understand the biology of drought tolerance.

Usage

data(DroughtStress)

Format

A data frame with 33 observations on the following 58 variables.

Variety

Variety

RWC_00

Relative Water Content (RWC %) at 0 PEG Concentration

CO2FIx_00

CO2 Fixation rate at 0 PEG Concentration

Cond_00

Conductance at 0 PEG Concentration

IntCO2_00

Intracellular CO2 Concentration At 0 PEG Conc

RWC_05

Relative Water Content (RWC %) at 5 PEG Concentration

CO2FIx_05

CO2 Fixation rate at 5 PEG Concentration

Cond_05

Conductance at 5 PEG Concentration

IntCO2_05

Intracellular CO2 Concentration At 5 PEG Conc

RWC_10

Relative Water Content (RWC %) at 10 PEG Concentration

CO2FIx_10

CO2 Fixation rate at 10 PEG Concentration

Cond_10

Conductance at 10 PEG Concentration

IntCO2_10

Intracellular CO2 Concentration At 10 PEG Conc

RWC_15

Relative Water Content (RWC %) at 15 PEG Concentration

CO2FIx_15

CO2 Fixation rate at 15 PEG Concentration

Cond_15

Conductance at 15 PEG Concentration

IntCO2_15

Intracellular CO2 Concentration At 15 PEG Conc

RWC_20

Relative Water Content (RWC %) at 20 PEG Concentration

CO2FIx_20

CO2 Fixation rate at 20 PEG Concentration

Cond_20

Conductance at 20 PEG Concentration

IntCO2_20

Intracellular CO2 Concentration At 20 PEG Conc

RWC_25

Relative Water Content (RWC %) at 25 PEG Concentration

CO2FIx_25

CO2 Fixation rate at 25 PEG Concentration

Cond_25

Conductance at 25 PEG Concentration

IntCO2_25

Intracellular CO2 Concentration At 25 PEG Conc

Details

Drought stress tolerance may be exhibited by plants through their ability to maintain a higher water potential under stress conditions (dehydration avoidance) or by maintaining physiological processes like photosynthesis at lower water potentials (dehydration Tolerance). 11 Sorghum bicolor (jowar) varieties, known to differ in their drought tolerance, were compared for their photosynthetic adaptation. Columns B, C, D and E are all responses (photosynthetic traits). It is of interest to compare these 11 varieties with respect to the responses measured, at a given value of PEG concentration. Also it is of interest to model changes in each response as functions of PEG concentration and comparing these models across varieties. Suggested tools include ANOVA, MANOVA, regression, and Graphical techniques.

Source

http://ces.iisc.ernet.in/hpg/nvjoshi/statspunedatabook/databook.html

Examples

data(DroughtStress)