板栗栗苞和子房生长发育呈“S”曲线。盛花期后28-35d为球形胚，盛花

The growth and development of chestnut buds and ovary showed an "S" curve. It is a globular embryo at 28-35d after full flowering, a heart-shaped embryo at 35-40d at full flowering, a torpedo-shaped embryo at 40-42d after full flowering, and a cotyledon-shaped embryo at 42-49d after full flowering, and the embryo matures at 104d after full flowering. Form seed kernels. During the development of chestnut embryo, the endosperm cells also experienced the cellularization phase, the growth differentiation phase, and the cell maturation phase. Embryo development mode is willowleaf type, endosperm is nuclear type endosperm. With the development of the embryo, the nutrient protein starch, protein, and polysaccharide in the embryo show an increasing trend. During the development of the chestnut embryo, the nutrients such as starch, polysaccharide and protein are transported from the pearl to the embryo. During the entire development process of the embryo Starch, polysaccharides and protein are all accumulated continuously. Among them, starch is mainly distributed in the outer integument tissue, and polysaccharide substances are mainly distributed in the inner integument. The nuts mature from late September to early October. At the same time, the long and short axis diameters of the starch grains of different stages showed an "S" curve. At 58 days after flowering, the area of ​​the starch grain was 9.32±1.76μm2, the diameter of the long axis was 7.99±0.48μm, and the diameter of the short axis was 4.14～13.38μm. . 110 days after flowering, the maximum average area of ​​amyloid was 91.89±7.58μm2, the long axis diameter was 22.45±1.52μm, and the short axis diameter was 13.38±1.37μm. The 51d after flowering is the initial stage of starch formation, and the starch in the cotyledons is not granular. 58-94d after flowering is the critical period for the formation of starch, the starch grains gradually increase, cobblestone-like starch. 94d after flowering is the late stage of starch granule formation, and the starch is spherical.

Chestnut chestnuts and sub-rooms have an "S" curve. After the flowering period 28-35d for the spherical embryo, the flowering period 35-40d for the heart-shaped embryo, after the flowering period 40-42d for the torpedo-shaped embryo, after the flowering period 42-49d for the sub-leaf embryo, after the flowering period 104d embryo mature, forming a seed. During the development of chestnut embryo, endosperm cells also experienced the cellization period, the growth differentiation period and the cell maturation period. The embryo development mode is willow vegetable type and the endosperm is nuclear embryo milk. With the development of the embryo within the nutrient protein starch, protein, polysaccharine is increasing trend, chestnut embryo development process is from the beaded starch, polysaccharine, protein these nutrients transported to the embryo, in the embryo's entire development process starch, polysaccharine and protein are constantly accumulated, of which starch is mainly distributed in the outer bead tissue, polysaccharine substances are mainly distributed in the inner bead. Nuts mature from late September to early October. At the same time, the long shaft and short shaft diameter of the starch grains of different periods were shown as "S" curve, after flowering 58d, the area of starch grains was 9.32±1.76 m2, the diameter of the long shaft was 7.99±0.48 m, and the diameter of the short shaft was 4.14 to 13.38 m. After flowering 110d, the average area of starch is up to 91.89±7.58 m2, the diameter of the long shaft is 22.45±1.52 m, and the diameter of the short shaft is 13.38±1.37 m. At the beginning of starch formation after flowering 51d, starch in the sub-leaf is not granular. After flowering 58-94d is the key period of starch formation, starch grains gradually increase, pebble-like starch. After flowering 94d is the late stage of starch grain formation, starch is spherical.

The growth and development of chestnut bracts and ovaries showed an "s" curve. The spherical embryo was 28-35 days after full bloom, the heart-shaped embryo was 35-40 days after full bloom, the torpedo shaped embryo was 40-42 days after full bloom, the cotyledon shaped embryo was 42-49 days after full bloom, and the embryo matured and formed seed kernel 104 days after full bloom. During the development of chestnut embryo, endosperm cells also went through the stages of cell transformation, growth differentiation and cell maturation. The development pattern of embryo is Salix type and endosperm is nuclear type. With the development of embryo, the nutrients such as starch, protein and polysaccharide increased. Starch, polysaccharide and protein were transported to the embryo from Zhubing during the development of embryo. Starch, polysaccharide and protein were accumulated continuously during the whole development of embryo. Starch was mainly distributed in the outer integument, and polysaccharide was mainly distributed in the outer integument In the inner integument. Nuts mature from late September to early October. At the same time, the diameter of long axis and short axis of starch grains in different periods showed "s" curve. 58 days after anthesis, the area of starch grains was 9.32 ± 1.76 μ m2, the diameter of long axis was 7.99 ± 0.48 μ m, and the diameter of short axis was 4.14-13.38 μ M. 110 days after anthesis, the average area of amyloplast was 91.89 ± 7.58 μ m2, the diameter of long axis was 22.45 ± 1.52 μ m, and the diameter of short axis was 13.38 ± 1.37 μ M. 51 days after anthesis was the initial stage of starch formation, and the starch in cotyledons was not granular. 58-94 days after anthesis is the key period of starch formation, starch grains gradually increase, cobblestone starch. 94 days after anthesis is the late stage of starch granule formation, starch is spherical.<br>