Generation and multiplication of plantlets from callus derived from Haplopappus gracilus (Nutt.) Gray and their karyotype analysis.

Generation and multiplication of plantlets from callus derived from Haplopappus gracilus (Nutt.) Gray and their karyotype analysis.
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来自 Haplopappus gracilus (Nutt.) Gray 愈伤组织的幼苗的产生和繁殖及其核型分析。

DOI:
10.1016/0168-9452(91)90240-9
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发表时间:
1991
期刊:
Plant science : an international journal of experimental plant biology
影响因子:
--
通讯作者:
Krikorian,AD
Krikorian,AD
中科院分区:
--
文献类型:
--
作者:
Kann,RP;O'Connor,SA;Levine,HG;Krikorian,AD

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未打开的花头ofHaplopappusgracilis(2n= 4)提供了初级外植体愈伤组织的产生和随后的诱导有组织的生长。用苄氨基嘌呤(BAP)(44.4 μM; 10 mg/l)和萘乙酸(NAA)(0.54 μ M; 0.1 mg/l)从小的(3-5 mm长)花芽中引发愈伤组织。将BAP水平降低到4.44 μM(1 mg/l)但保持NAA水平,从未分化的愈伤组织块中产生了有组织但高度压缩的芽生长点。从这样的培养物中选出的芽是保持的,并且可以通过在含有0.444 μM(0.1 mg/l)BAP和0.054 μ M(0.01 mg/l)NAA的Murashige和Skoog基本培养基(用琼脂固化)上生长1-1.5-cm的茎尖插条来增殖。通过这些方法获得的茎尖增殖率允许用于芽增殖或产生生根小植株的可靠策略。长时间的继代培养和保持芽生长调节剂自由的培养基导致在体外开花,大大降低生根能力。染色体核型分析和染色体测量结果表明,可以获得染色体数目和形态均一的试管苗。
Unopened flower heads ofHaplopappus gracilis(2n= 4) provided primary explants for callus production and subsequent induction of organized growth. Callus was initiated from small (3–5 mm in length) floral buds with benzylaminopurine (BAP) (44.4 μM; 10 mg/l) and naphthalene acetic acid (NAA) (0.54 μM; 0.1 mg/l). Lowering the BAP level to 4.44 μM (1 mg/l) but maintaining the NAA level, gave rise to organized but highly compressed shoot growing points from an otherwise undifferentiated callus mass. Shoots selected from such cultures were maintainable and could be proliferated by growing 1–1.5-cm stem tip cuttings on Murashige and Skoog basal medium (solidified with agar) containing 0.444 μM (0.1 mg/l) BAP and 0.054 μM (0.01 mg/l) NAA. The stem tip multiplication rates obtainable by these means permit reliable strategies for shoot multiplication or production of rooted plantlets. Prolonged subculture and maintenance of shoots on growth regulator-free medium leads to in vitro flowering and greatly reduces rooting capacity. Karyotype analysis of chromosomes from root tip cells at metaphase and chromosome measurements show that karyologically uniform plantlets (based on chromosome number and morphology) can be obtained.
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