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Nucellus
英音[ njuːˈseləs ] 美音[ ˈnjʊseləs ]
[植] 珠心
常用释义
词性释义
n.
[植] 珠心
例句
全部
A
minute
structure
in
seed
plants
,
containing
the
embryo
sac
and
surrounded
by
the
nucellus
,
that
develops into
a
seed
after
fertilization
.
种子植物的一个小的结构，含有胚囊并被珠心所包围，施肥后长成种子。
Cell
walls
were getting thick in
nucellus
cells
near the female gametophyte
and
polysaccharides
accumulated
abnormally
.
2
.
另外不育系胚珠珠心组织细胞异常加厚，多糖物质出现异常积累。
The
result
indicated
that the
corn
is
an anatropous
ovule
,
thick
nucellus
embryo
sac
.
结果表明玉米是倒生胚珠，厚珠心胚囊。
The
tube
nucleus
disintegrates
as
the
pollen
tube
penetrates
the
nucellus
.
另外的粉管核会在花粉管穿过珠心时发生分裂。
integument A layer surrounding the
nucellus
in the
ovules
of
gymnosperms
and
angiosperms
.
是裸子植物和被子植物的胚珠中包裹珠心的结构。
Food
materials
may
be
stored
in
a
special
tissue
derived
from
the
nucellus
,
called
the
perisperm
.
营养物质可以贮藏于由珠心产生的一种特殊组织，叫外胚乳。
In
the
second
year
,
the
resting
pollen tube
revives
its
activity
in
the
nucellus
towards the
March
.
第二年三月，休眠的花粉管在珠心内恢复活动，四月形成二个不等的雄配子。
Ultrastructural
Study
of
Nucleus
Transfer
in
Nucellus
of
Pennisetum
squamulatum
非洲狼尾草珠心细胞核穿壁运动超微结构研究