Photosynthesis is the process by which plants use sunlight to synthesize energy. Chloroplasts are organelles found within plant cells that are vital to photosynthesis. Inside the chloroplast are flattened sacs called thylakoids that are the location of the light reactions of photosynthesis. Chlorophyll, the pigment that gives leaves their green color, is crucial to the absorption of light energy and the amount present in a single leaf is an indicator of photosynthetic capacity. In previous studies, the chlorophyll content in the leaves of fruiting and non-fruiting trees were studied to see if there was a difference between the two (Vemmos 1994). Another studying comparing the rate of photosynthesis in peach tree leaves found that the leaves with the highest photosynthetic rate were the ones closest to the fruit and had their highest rates during the final part of the fruit maturation process (Crews 1975). A study showed that there were highly significant, linear relationships between portable chlorophyll meter readings in tropical and subtropical fruit-tree species (Schaper 1991). For this research project, the chlorophyll content of leaves from Malus sutyzam trees is being measured and analyzed to determine if the proximity of leaves to fruit effects chlorophyll content within individual leaves.
If chlorophyll content in individual Malus sutyzam tree leaves is related to the relative position of the leaf to the fruit, then the chlorophyll content will be higher in the leaves closer to the fruit. Choose 5 Malus’Sutyzam' trees and measure distance from base of fruit stem to base of leaf stem to where the leaf attaches to the branch. Collect data with chlorophyll meter from 5 leaves 0-5 cm away from the base of the fruit, and then 5 leaves 5-10 cm from fruit. Begin measuring leaves in the southeast quadrant and move clockwise onto the southwest quadrant and so on around the entire circumference of the tree. Collect data from the 5 different trees.
- Leaf Photosynthesis - MultispeQ Beta ONLY
Measures photosynthesis-related parameters in <15 seconds, including: Phi2, PhiNPQ, PhiNO, NPQt, qL, LEF, and SPAD. In addition, measures PAR (photosynthetically active radiation), ambient temperature and relative humidity.
Works with the MultispeQ Beta device only
- What is the tree code for Malus sutyzam trees? (Multiple Choice)
- Which quadrant? (Multiple Choice)
- Distance to crabapple (Multiple Choice)
- Random sample count (Multiple Choice)