ピーベリーとは何ですか？

Coffeeberry all over the world mostly gives out two beans from a single berry. in case of a peaberry, a single bean is extracted from a berry. That makes peaberry coffee beans unique.

There is no specific reason for this as it's natural mutation and just 5-10% of the coffee produced from the plantation is estimated to be pea-berry. The shape of the coffee beans are flat at the center and curved at the sides, but in the case of pea-berry, the coffee beans are round like pea as there is only single bean the berry. 

Merchant and coffee traders earlier believed that these beans were not of use. They would consider these as defective until they realize that the beans were coffee beans with benefits.

The round shape can allow free movement of beans inside the drum, giving a more even roast.People also believe that the beans are denser and tastes sharper, sweeter, and juicier.

Roasting peaberry requires a slow and steady roast. The roasting process becomes complex as the beans we are dealing with are dense and have special characteristics than the other coffee beans.

The way to get these beans segregated from the entire production is bypassing all the beans through the screening size machine where these small round beans get separated from the lot and these are then sold separately at a slightly higher price. 

However, the scientific reason and the best explanation we could find is:- 

ピーベリーの根本的な原因は、胚珠が受精しないか、胚乳の成長に失敗することです。これらの二つの状態を引き起こす要因として、受粉不足、環境条件、遺伝的欠陥が考えられています。ピーベリーは植物の端においてはるかに一般的で、そこでは気象条件が厳しく、栄養素の移動がはるかに長く、受粉の要因である重力や風（昆虫が受粉のわずか5-10%を占めると推定されています）が花の柱頭に到達するのが難しくなります。

カサ・ブラジル・コーヒー