7 days old	16 days old

This stock has two recessive traits: non-purple stem and yellow-green leaf. Plants in this stock have no purple expressed in any part but are a clear, bright yellow-green color, quite a stand-out in a mixed population.

Tips for the Grower
Moderate experience with growing Fast Plants is recommended prior to using this stock.

Notes on Genetics
This is the one Fast Plants stock available that did not naturally occur in the base population. It was developed by combining the two genotypes through dihybrid crosses of parents each having only one of the two traits. Each of the two individual traits are the result of single gene mutations. The single recessive gene for non-purple stem "blocks" the expression of the purple pigment anthocyanin. The genotype for this stock is an/anl, ygr/ygr.

Ideas for Investigations
Genetics - A primary use for this stock is as the testcross for the investigation of linkage. It can also be used as one parent in a dihybrid cross (the other parent being the standard stock).

Physiology - Do these plants have the same amount of chlorophyll as the standard stock? Investigate whether this phenotype affects the plant's photosynthetic efficiency.

Ecology - Explore the positive and/or negative adaptive attributes associated with this genotype. Does the lack of anthocyanin makes the plants more vulnerable to UV irradiation? Does it have any impact on the plant's defense against herbivory, or prevention of oviposition by insects?

C. O. Chichester, The Chemistry of Plant Pigments, Academic Press (New York), 1972.

T. W. Goodwin, ed., Chemistry and Biochemistry of Plant Pigments, Academic Press (New York), 1976.

G. Mazza, Anthocyanins in Fruits Vegetables and Grains, CRC Press (Boca Raton).