BETA VULGARIS 



2-51 



and oily materials and the perisperm is packed with large starch 

 grains except at the chalazal region. Starch is not found in the 

 resting embryo but may appear there during germination. With 

 respect to the movement of reserve foods into the storage tissues 

 of the seed, Bennett and Esau find that the vascular strand which 

 passes through the funiculus is collateral; but after it has entered 



perisperm. 



t. endosperm. 



embryo - 



nucellus - 

 i.cuticle- 

 i.integument- 



o.integument - 



0. cuticle • 



p. endosperm 



funiculus 



Fig. 119. Section through ovule and young embryo showing structure of seed and seed 

 coat. (After Artschwager, Jour. Agr. Kes.') 



the chalazal region, it tends to be amphicribral, and the phloem 

 extends farther than the xylem. (Fig. iio, A-I.') No direct 

 vascular connection exists between the embryo and the storage 

 tissues adjacent to it, but protoxylem elements are completely 

 differentiated in the cotyledons before germination, and proto- 

 phloem elements are also present. 



Development of the Seedling. — Under favorable conditions 

 for germination, the primary root pushes through the seed and 



