第1報に於いては五倍小麥雜種 Triticum polomcum (2n=28)×T. spelta (2n=42) の戻雜種及びF₂を用ひて, 染色體數と密接な關係ある二三の形態學的形質の遺傳を研究し, それ等に對する因子はDゲノムの染色體に存することを確めた。今囘は同一材料並びにそのF₃に於いて, 芒の有無•稈節の毛•苞穎の毛及び外穎と内穎との長さの差の遺傳現象を究めた。これ等の各形質は孰れも單因子雜種の分離比を示し, 染色體數と無關係に遺傳するから, A又はBゲノムの染色體上に夫々の因子座を占めるものである。
無芒因子Nと稈節の有毛因子 H_n との間にのみ約28.5%の聯關を發見し, F₃に於いてもこれを確めた。T. polonicum は外穎が内穎より著しく長い。これはこの種に特有な因子Pによるもので, この因子は又芒の長さ及び苞穎の毛の長さをホモの状態に於いて抑制する。即ちP因子は多面的發現作用 (Pleiotrope Wirkung) を有する。

抄録全体を表示

The lady-bird beetle, Harmonia axyridis PALLAS is a highly variable species. The author experimented on the inheritance of the color pattern and also on that of the presence and absence of a transverse ridge on the elytra.
The elytral color patterns may be classified into six types as follows:
1. s type (succinea)-(Fig. 1-a, b, c)
2. A type (aulica)-(Fig. 1-d, e)
3. S type (spectabilis)-(S₁ subtype-Fig. 1-f. S₂ subtype-Fig. 1-g)
4. AS type-(Fig. 1-h, i)
5. C type (conspicua)-(C₁ subtype-Fig. 1-j. C₂ subtype-Fig. 1-k)
6. AC type-(Fig. 1-l, m)
Each of s, A, S and C types is determined by a factor which shows inheritance as follows:
1. s is largely recessive to any of the other types.
2. AS is the hybrid between A and S.
3. AC is the hybrid between A and C.
4. S is a simple recessive to C.
5. The subtype S₁ is the homozygote, while the subtype S₂ is the heterozygote of S and s. The subtype C₁ is the homozygote or the heterozygote of C and S, while the subtype C₂ is the heterozygote of C and s.
Genes p, P^A, P^S, and P^C which determine the appearance of s, A, S and C respectively constitute a set of quadruple allelomorphs and are autosomal.
Hence, genic constitution of the six phenotypes may be designated follows:
s type-pp
A type-P^AP^A, P^Ap
S type-S₁ subtype-P^Sp^S,
S₂ subtype-P^Sp.
AS type-P^AP^S.
C type-C₁ subtype-P^CP^C or P^CP^S
C₂ subtype-P^CP.
AC type-P^AP^C.
Tan and Li's interpretation (Amer. Nat. 1934, 68: p 252-265) on the inheritance of pattern types of the same beetle which is based on mutually independent genes seems inadequate.
The presence (Fig. 2-a) or absence (Fig. 2-b) of a ridge on the elytra is also inherited on the monohybrid basis.
The factor (R.) for presence is dominant to the factor (r.) for absence.

抄録全体を表示

1. In Punica granata L. and P. granata var. nana PERS. three pairs of genes, Cc, Ss, and Rr, concerning flower colours were determined. R produces red flower when S and C are also present; S produces salmon pink flower in the presence of C, while C by itself does not produce any colour.
2. 8 gemini were found in the PMC of Punice granata L. and P. granata var nana PERS. The meiosis is normal so that the pollen grain nucleus contains 8 chromosomes.

抄録全体を表示

開花前の稻の穗を莖と共に切取り、水に挿し、去勢を行つて30°C飽和状態の定温器中に置き、翌日授粉して更に同樣な状態に保つときは、完全な授精が行はれて粒子の發育を見る。定温器中に在ること5日にして莖の下節からは相當數の根を生じ、その後室温に移しても莖葉は緑色を保つて生存し、約3週間後には成熟せる種子を得る。此の方法は小規模に周圍の状態を調節し得べき點より、稻交配の一技術として將來實際上に利用さるべきものと信ずる。

抄録全体を表示