银杏苗基生垂乳的生长特性

Growth Characteristics of Basal Chichi in Seedlings of Ginkgo biloba

  • 摘要: 以1年生和4年生银杏苗为对象,观察其基生垂乳生长状况。共调查1年生银杏苗211株,4株有基生垂乳着生,基生垂乳发生率为1.90%;4年生银杏苗478株,302株有基生垂乳着生,基生垂乳发生率为63.18%。4年生银杏苗中,单垂乳单株有221株,占73.18%;双垂乳单株有60株,占19.87%;3个垂乳单株18株,占5.96%;4个垂乳单株3株,占0.99%。1年生银杏苗垂乳长度最大为0.7cm,最小为0.5cm,平均为0.6cm;基径最大为0.50cm,最小为0.30cm,平均为0.38cm。4年生银杏苗垂乳长度最大为6.0cm,最小为0.2cm,在0~1.5cm范围内个数最多;基径最大为4.0cm,最小为0.2cm,在1.0~2.0cm范围内垂乳个数最多。单株垂乳个数和萌蘖对垂乳长度、基径影响明显。4年生银杏苗的基生垂乳均着生不定根,15株有新产生的不定根。

     

    Abstract: The incidence rate of basal chichi of Ginkgo biloba plants was studied with 1a and 4 a old seedlings. Out of 211 one year old seedlings, 4 seedlings were found to be with basal chichi, the incidence rate was 1.90%. Whereas 302 four years old seedlings out of 478 were found to have chichi whose incidence rate was 63.18% Among the 302 four years old seedlings with chichi, 211 seedlings were with single chichi, which accounted for 73.18%; 60 seedlings were with 2 chichi that accounted for 19.87%; 18 seedlings were with 3 chichi, accounting for 5.96%; and 3 seedlings with 4 chichi that accounted for 0.99%. The maximum length of basal chichi of 1 year old seedlings was 0.7cm, while the minimum length was 0.5cm, and the average basal chichi length from one year old seedlings was 0.6cm The maximum diameter of the basal chichi of 1 year old seedlings was 05cm, the minimum was 03cm and the average diameter was 0.38cm Whereas the maximum length of basal chichi of 4 years old seedlings was 6.0cm, the minimum chichi length was 0.2cm and the majority chichi were 0-1.5cm long. The maximum diameter of the basal chichi of 4 years old seedlings was 4.0cm, the minimum was 0.2cm and the diameter of the most chichi from 4 years old seedlings was 1.0-2.0cm in diameter. The length and base diameter of the chichi were significantly influenced by the basal chichi number and sprouting quantity. It was observed that 15 four years old seedlings developed adventitious roots from the basal chichi.

     

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